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Step 1
Try yard and garage sales. You can often find a few games for sale; they're just the kind of thing that people will part for in return for a few cents, especially when they don't have the console anymore.
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Step 2
Find a vendor. These small shops used to be all over the place. Today, most game vendors don't carry Atari anymore, but some of them might still have a back stock of Atari cartridges along with Nintendo and Sega. Look in flea markets and other informal used markets for the guy with boxes full of game cartridges, and sound him out on where Atari games can be found.
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Step 3
Contact the manufacturer. Although this step is not entirely necessary, and can be a hassle, Atari will have information about its products that you won't be able to find anywhere else. If you're really serious about collecting, the manufacturer can give you needed details about how the company worked through its boom time, and what kind of market situations resulted.
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Step 4
Search online vendors. AtariGuide is a major seller of used Atari games, with a long list of games available. Also try Atari Shop for some mint-condition games and a variety of Atari products. Keep looking: select several vendors and compare for pricing and conditions.
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Step 5
Try eBay. Atari game cartridges are among the natural types of things to be found on eBay. The vast accumulations of Atari game cartridges combined with the scarcity of consoles and developments in gaming led to a glut of Atari games, which are frequently put on the eBay auction block.
