Stock photos for resale templates

I was wondering if anybody had a resource from which they get stock photos to use in resale templates? Free would be ideal, but cheap would suffice.

ie. Selling a template on Theme Forest, you would need a license on any photos that permits it's resale within the design work.

Ideally I don't want to be crediting anybody in the footer links as it will surely affect the value of the template.

See the sticky'd post in this forum: http://www.talkfreelance.com/showthread.php?t=31066 as a ton of stock photo places.