You can get 50 free 6 x 4 photo prints every month for a year when you download the Snapfish app for the first time (p&p £1.49).
Use TopCashBack for free, so that once you've run out of your free photo credit you can get up to 12% cashback on your purchase!
Sign up with Photobox for 30 free photo prints, available for 6 x 4, 6 x 4.5 and 5 x 3.75 (£2.99 p&p) no code required. After registering you have 30 days to claim the offer.
Go via Quidco to make sure that you receive up to 5% cashback on your Photobox order once you've used up your free photo allowance.
Register with Boots Photo and get 25 free 6 x 4 photo prints.
You can get 45 free 6 x 4 photo prints a month with the Free Prints App. Download the FreePrints app and use the promo code fjoyce21- you can get up to 500 free prints a year (£1.49 p&p).
You can get 50 free prints when you order 100 with Pixum. Use the promo code PIXUM-UK-50 (£2.99 p&p and dependent on size of print).