Deposit Photos is a really good repository of usable photos and graphics. I've used hundreds of their photos in various projects now. Their pricing also puts more established competitors to shame. Sure, you'll occasionally find a photo on a different service that's classier, but not often, and their pricing ... well, you might have to donate a kidney to afford it. Deposit photos is all I need now. I really don't have to pay more, so why would I? Recommended.