With news that istockphoto‘s prices are going up in 2007 you may be shopping around. Here are all my main resources:

• istockphoto.com
  1,278,601 images. Images ranging in size from XS 350kb to XL 46MB.
• dreamstime
  820,000 images. High res images for $1 with prices as low as $0.38 each.
• Stockvault.net
  4,000 FREE royalty free high res stock photos. All the free images & photos are at least 1600×1200 pixels in size. If you’re looking for SUPER high resolution textures you can buy images in packs of 25, as low as 20c per image.
• Morguefile.com
  Unknown archive size. A place to keep post production materials for use of reference, an inactive job file. This morgue file contains FREE high resolution digital stock photography for either corporate or public use.

Enjoy!