Buy retro games?

Where can I buy retro games from Nintendo, Sega and Atari?

In the beginning I would try eBay and eBay Classifieds. If you do not find it there, look for a German forum that has the theme of retro games and look there if it has a used market right away.

Whatever I can say are flea markets, you can try on and sell.

Simply ebay, in local gsechäften such as gamestop can be found at most ps3 games

You should look for retro shops in your city, often there are good prices. The internet is almost always more expensive. Only on eBay auctions you get the cheapest deals.

Try at my dealer of trust http://www.gamenatix.de or at dragonbox de