Go to CVS and you can get a free 5x7 or 8x10 print- good until 12/24. Use the code ENLARGE. Also if you sign up for a CVS photo account with your email you will get an email for 50 free 4x6 prints.
I just wanted to add- I just tried this deal- it said there was $1.49 surcharge on orders under $5. The 8x10's are $3.99 and the 5x7's are $1.49. I ordered one 5x7 and one 8x10 and entered the promo code ENLARGE. I was able to get BOTH prints for free- the subtotal was $5.38 so there was no surcharge.