This code is still working. Looks like tonight is the last night (April 26)!
Walgreens Photo is offering an 11×14 Poster for just $1.99 (reg. $10.99) with code SPRINGPOSTER. Choose in-store pickup to avoid having to pay shipping costs. It looks like you can order five at this price with the code!
Please note that this code doesn’t appear to work on the mobile app or in-store.