Through tomorrow, Shutterfly is offering 101 FREE 4×6 Photo prints with promo code 101PRINTS at checkout. Just pay tax and shipping charges. Shipping is $7.49 for 101 prints but if you reduce your order to 99 prints your shipping costs reduces to $4.99. That works out to be about 5 cents per print shipped.
Offer expires April 2, 2013 (11:59 P.M. PST).