York Photo has several coupons listed below. All supposedly last through 12/31. Their everyday low price is just $0.10 for 4x6" prints!

Buy one 5"x7" Print, get one free with coupon code YBB5X7 [Exp 12/31]

20% off photo gifts ordered online with coupon code YBBGIFTS [Exp 12/31]

20% off slimline cards, 4x6 or 5x7, with coupon code YBBSLIM [Exp 12/31]