Ralph Baer tried to design advenced cartridges equiped with some additional components to add more realistic features to the Odyssey. Unfortunately, nothing came out of this idea. Note the size of the contacts. The Odyssey is quite sought after by collectors as it is the first videogame system. It is not very hard to find an Odyssey in an auction web site like eBay .
Prices vary everytime depending on the demand.
If several persons are willing to purchase the same console, its final price can be quite high. In the other hand, an Odyssey can sell at a low price. In a general case, one who wants to buy this console must be patient, and not feel in the obligation of buying the first come. Extra stuff like add-on games, carry case and rifle pack add a significant value to the console. In the other hand, an incomplete console can sell for nothing.