Yes. try connecting to eBay or any of the other auction sites to get some of the best 20 year old games. So many people trying to sell off a little of the things they don't want any more. Atari games for under a buck. Coleco games for 50 cents. You can even get an intellivision for under 15 dollars. And these used to be 200 dollars. My advice for auctions is to do a web search first for what you are looking for to make sure you know what price you can get things for non auction. Then you know how much not to go over. There are plenty of places out there that keep inventory of old stuff. Most of the time it is more expensive. But once in a while you find a great bargain. Before buying at any auction check the sellers feedback. Ask questions in email. Ask for references. Question things. And then get ready for some good old retro fun.
I do quite a bit of selling on eBay. Check out my eBay button to see what I have up there right now.