I'm looking for a (commercial?) image library with images that I could use in a point-of-sale application. I'm looking for images like drinks (coke, water, fanta...), coffees, bread, cakes, fruits and vegetables. I'd like a library that would have all of these in one and preferably some standardized size and consistent shots (e.g. same angle, same background, same colour palette). Sites like iStockphoto.com have great images but they are very expensive to buy ($1/image) and they are all done by different people with different cameras, angles, lighting, backgrounds.
You can just google for "stock images", which will give you huge list of major stock image sites. Good images are seldom cheap, and if they are, you probably seen them used by many people. If cost is you concern, you can try site like stock.xchng.
The things you need to consider, do you:
want exclusive rights to those images?
need to print them (e.g. brochures, advertising)?
want to use them in redistributable products?
Make sure the license/conditions on which you purchased the images with match your requirements. I've heard of many cases of ugly situations from license violations.
Personally I use shutterstock.com. It allows me to download 25/day for a monthly subscription - that way I don't have to be so selective about what I download and I can try out a couple version before I do a final. There are coupons out there to get 15% off.
I don't know how many different product shots you need, but if it's like ten or twenty, couldn't you just set up some kind of primitive kit (a cardboard box with white insides, a nice lamp and a cheap camera on a tripod), get some groceries and start snapping?