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The most expensive item on SlashGear’s September 23, 2026 list of rare retro gaming accessories is the Elemental Gearbolt Assassin Case for the PlayStation. The article estimates it at up to $26,250 complete, and says one sold at Heritage Auctions in 2022 for $19,200. The cheapest entries, such as a loose Sharp Game Television controller, sit near $135. This guide walks through all 15 items: what each one did, why it is scarce, and what the article says it is worth.
Every price below is SlashGear’s estimate, not a verified current listing or a completed-sale record, unless stated otherwise. The article does not link transaction data for each item, and several production figures are unconfirmed.
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The 15 accessories at a glance
“Loose” means the item without its box. “Boxed” and “new” mean the original packaging is included. Figures are the article’s estimates, ordered here from lowest to highest top-end value.
| Item | System | Loose estimate | Boxed / new / unopened estimate |
|---|---|---|---|
| Sharp Game Television controller | NES | ~$135 | ~$1,200 |
| Saitek Booster Boy | Game Boy | ~$155 | ~$1,400 |
| Singer IZEK 1500 | Game Boy Color | ~$550–$735 (eBay listings) | ~$1,100 (unopened) |
| Steel Battalion Mega-Jockey-9000 | Xbox | ~$425 (complete bundle) | ~$1,500 |
| Game Genie Top Loader adapter | NES | ~$360 | ~$1,600 |
| TurboBooster-Plus | TurboGrafx-16 | ~$250 | ~$1,950 (new) |
| Atari 5200 carrying case | Atari 5200 | ~$500 | ~$2,250 |
| Nintendo 64DD keyboard | Nintendo 64DD (Japan) | not stated | ~$3,000 (new in box) |
| Stack-Up accessories | NES | ~$350 | up to $4,970 (new in box) |
| Color Bar Generator | Atari 2600 | over $575 | ~$4,995 |
| Outback Joey HeartBeat Personal Trainer | Sega Genesis | ~$3,505 (complete set) | ~$5,000 |
| Nintendo 64DD | Nintendo 64 (Japan) | ~$1,700 average | up to $7,600 (new) |
| Gold Game Boy Camera | Game Boy | ~$990 | ~$9,085 (unopened) |
| Millennium 2000 Controller | Nintendo 64 | up to $1,500 | $15,810 (boxed) |
| Elemental Gearbolt Assassin Case | PlayStation | not stated | up to $26,250 (complete) |
Functional peripherals that were oddities from the start
Singer IZEK 1500 (Game Boy Color)
This is a sewing machine controlled through a Game Boy Color, with five pattern “games.” The article says it launched in Japan and was later brought to the United States by Singer. Estimates: about $550–$735 for eBay examples and about $1,100 unopened.
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Steel Battalion Mega-Jockey-9000 (Xbox)
A large, HOTAS-style controller built for Steel Battalion. The game could be bought on its own, which is why the full bundle is the unusual piece. The article estimates about $425 for a loose complete bundle and about $1,500 boxed.
Sharp Game Television controller (NES)
The Sharp Game Television was a 19-inch CRT with an NES built into its base, sold through Kmart from 1989, with production ending the following year. The article puts the controller at about $135 loose and about $1,200 boxed.
Saitek Booster Boy (Game Boy)
One attachment combined speakers, arcade-style controls, lighting, a magnifier and game storage, powered by four C batteries. Estimates are about $155 loose and about $1,400 boxed.
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Game Genie Top Loader adapter (NES)
A separate adapter was needed to use the NES Game Genie with the top-loading NES. Compatibility matters here: the adapter is for that console model, and anyone buying should confirm the exact system and Game Genie version. Estimates are about $360 for the adapter alone and $1,600 boxed.
TurboBooster-Plus (TurboGrafx-16)
It replaces the console’s rear port cover and adds composite video and stereo sound in place of the standard RF connection. The article estimates about $250 loose and about $1,950 new.
Atari 5200 carrying case
A fitted case for the console, games and components. The article says Atari 5200 sales were much lower than Atari 2600 sales, though it acknowledges the exact figures are unclear. It estimates about $500 loose and about $2,250 boxed.
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Japan-only and low-volume Nintendo hardware
Nintendo 64DD
The 64DD disk-drive peripheral was sold only in Japan. The article reports around 15,000 units sold and 10 games. It estimates an average of about $1,700 for a loose unit and up to $7,600 for a new one.
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An uncommon accessory for the same Japan-only system. The article estimates $3,000 new in the box.
Stack-Up accessories (NES)
These pieces tie to Stack-Up and Nintendo’s ROB (Robotic Operating Buddy), which supported only a small number of games. Estimates run about $350 loose and up to $4,970 new in the box.
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Promotional, trade and prize items
Color Bar Generator (Atari 2600)
A cartridge that generates color bars for television repair, attributed to Gerald “Jerry” Lawson. It went to repair professionals rather than the public. The article reports over $575 loose and about $4,995 boxed.
Outback Joey HeartBeat Personal Trainer (Sega Genesis)
Hardware bundled with the game Outback Joey, including the HeartBeat Catalyst, which the article says monitors heart rate, skin salinity and movement. It cites a 1,000-unit production figure and estimates about $3,505 for a loose complete set and $5,000 boxed. Both the production number and the details rest on this one article, so treat them as unverified.
Gold Game Boy Camera
A gold U.S. version offered through Nintendo Power to promote The Legend of Zelda: Ocarina of Time. The production quantity is unclear; the article speculates about 2,000, which is conjecture rather than a confirmed run. Estimates are about $990 loose and $9,085 unopened.
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Millennium 2000 Controller (Nintendo 64)
The article says 1,000 were made for the year 2000, in silver with black buttons. It estimates up to $1,500 loose and $15,810 boxed. It also notes that a loose example failed to sell at Heritage Auctions in 2024, so the high estimates are not proof of what a buyer will pay.
Elemental Gearbolt Assassin Case (PlayStation)
A prize for fewer than 50 winners of a Working Designs competition at E3 in 1998. It contained a copy of the game, a gold-plated GunCon, a red or gold-plated memory card and a metal case. The article reports a $19,200 sale at Heritage Auctions in 2022 and separately estimates up to $26,250 complete. The first is a realized sale; the second is an estimate.
Quick Recap
How to read these prices if you are buying or selling
- Sold beats estimated. Only the 2022 Assassin Case sale is a reported realized result, and the 2024 Millennium controller is a reported non-sale. Everything else is an estimate. Check completed sales on eBay or auction-house archives for the exact item, in the same condition, within the last year or two.
- Condition tiers are not interchangeable. The article’s loose, complete, boxed and unopened figures often differ by a factor of ten or more. Match your item to the exact tier.
- Verify compatibility. Many of these items fit one console revision or region only, such as the top-loader NES adapter or the Japan-only 64DD parts.
- Treat scarcity numbers with care. Production counts like 1,000 or “fewer than 50” come from the article, and the source itself calls some quantities unclear.
- Thin markets move unpredictably. With so few examples changing hands, one sale or one failed auction can swing perceived value.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
