iStockPhoto is amazing for large, professional icons. You can buy sets of icons (usually around 12 icons/set) for about $1 per icon. It's better than the altern

iStockPhoto is amazing for large, professional icons. You can buy sets of icons (usually around 12 icons/set) for about $1 per icon. It's better than the alternative of having to shell out $100+ for a large icon set, when you really only need a couple out of the batch.