Exactly - it's ridiculous. I live near one of the big ones on Metropolitain and when I went there with the GF once I checked out the few booths that were literally filled with retro games... The prices were ridiculous, I saw Dragon Warrior 1 carts for 50$. That's some seriously funny shit as there's no way that particular game is rare or worth that amount of money, as it's so damn common due to Nintendo giving it away with Nintendo Power subs that everyone and their dog has it. But hey, some dude goes 'DRAGON WARRIOR!!! WOW!!! 50$ PLZ"
Flea markets used to be places where you'd get, you know, average deals. Now it's literally people who just sell there instead of eBay but sell at eBay price + shipping, which is already stupid. I still don't know how eBay is still alive, I haven't seen an actual good price for anything on there in a LONG ass time. The only reason I know people use it is to buy phone covers from china for like a buck with free shipping.
That's because you go to huge flea markets. The one on Métropolitain and the big ones like the one in St-Eustache are filled with people selling overpriced stuff because the booths are run by people who knows the values of games. The best ones are the small community based ones or garage sales during the summer. I live on the south shore and I can find nice stuff all the time.