Amazon’s photo printing service is currently giving away 50 free 4″ x 6″ prints to all customers. Simply upload your photos (or select them from Amazon Drive/Prime Photos), select at least 50 standard 4″ x 6″ prints, and use promo code 50FREE at checkout. Shipping is free if you’re a Prime member, otherwise shipping starts at $4. Shipping is free for non-Prime members if you spend at least $15. This offer ends May 30th.