Atari 2600 games were almost as easy to find as Nes games were at a flea market back in the 1980's...and I got over 120 Atari 2600 games by December of 1991.
Yeah, I started in 1982 at the huge outside flea market in San Jose...so big it takes all day to walk around; can't even make it if you try to look at everything. About 1986, once Nintendo became the latest craze, Atari games were lined up on tarps everywhere like VHS tapes are today. Nobody wanted them and there weren't many collectors either. "How about a dollar for these four?"; "OK."
By 1990 or so, I had a couple hundred different VCS games, plus lots for other systems as well. Beginning of the End
, as they say.
I've only seen a few other places that have similar huge flea markets like that, such as Oakland, Santa Cruz, a couple in LA area, Phoenix, Albuquerque.
Once you get to the colder places, they have indoor flea markets that are more like antique malls where the stuff doesn't turn over very much and prices are higher. For some reason, prices at these places are sometimes higher than retail, even when you can still buy the item at Toys R Us. I guess some fools pay it. I've also seen the same dusty stack of games sitting on a back shelf for several years. The indoor sellers just don't have the same incentive to sell; they don't have to pack it up at the end of the day and put it somewhere else.
Some of them, at least, offer space outside in the parking lot in summer months that can approximate a REAL flea market if enough people come to sell their junk. Also, some communities promote a city-wide garage sale weekend once or twice a year that is pretty close, except you have to drive a lot more.