Mpix often has specials, and right now they're offering 50% off all 8x10 prints. That's $0.99 for E-surface (matte) prints and $1.25 for metallic and "True B&W" prints - better than you'll find anywhere else. Lustre coatings and other extras are still, well, extra.
It ends at midnight CST tonight - July 27, 2011 - so hurry! Use the promo code "summerphotos" to get the discount - don't worry that you'll see the full price for the photos at first, you'll enter the promo code before you finish checking out.
Shipping prices are reasonable via Priority Mail.