This is a great idea.
I found this site while looking up info on the flea markets I go to. It's a list of flea markets, listed by state.
http://www.keysfleamarket.com/fleamarket/state/Michelangelo's Flea Market Sundays
2475 Benjamin Franklin highway ,Edinburg, PA 16116
Very small outside, somewhat good size indoors. Not very good for video games, I've found a couple things, but nothing noteworthy. With gas prices these days, it's not worth it for me to go, but if you live close, it's worth a look.
Four Seasons Flea Market
8am-4pm Sundays and Wednesday, Wednesday is usually small and slow though.
3000 McCartney Road
Youngstown, Ohio
http://fourseasonsfleamarket.com/Very awesome flea market, tons of stuff. It's my favorite flea market, there's usually a few video game vendors with decent prices and many people with random stuff that have different stuff every week.
Rogers Flea Market & Auction
Fridays, 7:30 a.m. to dark
http://rogersohio.com/def...t2.asp?active_page_id=12845625 State Route 154 West, Rogers,Ohio
Absolutely HUGE flea market. It's kind of far for me, so it's a special trip a couple times a year. There are several video game vendors, but prices are generally on par with eBay prices, and many games are old and sun faded. It's still possible to find some deals from people selling random stuff.