Get 50 4 X 6 prints for 50 cents at Snapfish. That's a penny a piece + shipping. This is advertised on their Facebook page as being a "day early" offer for their Fans, but I don't think that you need to be a fan. Use code JULY4PENNY at checkout. Offer is good through July 11th.
New to Snapfish? Sign up and get 20 FREE prints (it seems to bounce back and forth between 20 prints and 50 prints). Plus, they often have great freebies. I just recently received an email to get a FREE photobook. Check out this post to see how to get a FREE 8 X 10 Photo Collage from Snapfish- valid until July 5th.