The value of a ROB unit, similar to other retro gaming hardware, depends on its condition. If it is no longer in its packaging and has visible wear and tear, its worth will be less. However, if it is still in its original factory-sealed state, its value will be higher.

According to PriceCharting, a loose ROB unit can be sold for an average of $153, which is quite a decent amount for an old gaming peripheral. However, if it includes all of its packaging and manual, a complete-in-box ROB can fetch around $300. In the unlikely scenario that you own a mint condition ROB unit that is still in its original packaging, you might be able to sell it for as high as $500 to the right buyer. It is worth mentioning that if you have both a sealed NES console and a ROB unit bundled together, the value could increase significantly. An unopened NES and ROB combo pack could be worth well over $1,000.

Apart from the Western version of ROB, Nintendo also released a Japanese equivalent for the Famicom called the Family Computer Robot a few months prior. It is essentially the same device but with a different color scheme and packaging. However, the Japanese version is not as valuable as the NES version. A loose Famicom Robot can be sold for around $77, while a complete and sealed one can fetch around $100 to $125.