The http://www.shutterstock.com/ http://www.shutterstock.com/ seems to be fairly popular if you have non-zero budget. Lot of people seem to rip off images from

The http://www.shutterstock.com/ http://www.shutterstock.com/ seems to be fairly popular if you have non-zero budget. Lot of people seem to rip off images from Tublr themes as well. I've seen also lot of torrents on places like Pirate Bay (look for Top 100 section) but you need to make sure it license is free for any usage (lot of providers do look out for people stealing images without license).