Dude, free icons! Nice ones, too. These are even available for commercial use.
Almost every website can be enhanced with a choice set of icons to add visual interest, improve navigation, or enhance its UI. The following blogpost by Ash Stallard-Phillips (a UK web designer) is a nice group of icons sets that you can use for your website or app.
Best Free Web Icons for Commercial Use | Ash.guru via The Treehouse Show (Episode 125)