Source for various pictures in 120x120?

I am creating a web site with 2-stage authentication where users will have to verify a particular image on the screen (similar to how many banks and CC companies are currently 开发者_运维知识库doing this).

Where can I find a large source of images (not icons) that are about 120x120 (or larger) for use in this? Ideally, Id like to find a few hundred of these images and they do not have to be free.

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You could search for Creative-Commons photos available for commercial use on flickr: http://www.flickr.com/search/?q=nature&l=comm&ss=0&ct=0&mt=all&w=all&adv=1

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I've used freedigitalphotos.net in the past to get some pretty good images -- you can get the small ones (about 640x480) for free.

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Well, there's Google's image search, the options let you specify the exact dimensions you're after, and they'll search most stock-photo/art sites, too.

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iStockPhoto sells stock photography, you can just buy the lower rez stuff.