Buy One Get One Free On Cards @ Moonpig
Moonpig prices are already really good for personalised cards, and right now they have a Buy One Get One Free offer as well! There's no code to enter, you just order 2 cards and the cheapest one is free. I love nice, simple offers like this.
The BOGOF is on all orders placed before 5pm tomorrow Wednesday 15th April, so just have a wee look at your calendar and see what event are coming up. There are thousands of cards to choose from for Birthdays, Anniversary, Thank You, and tons more. Father's Day isn't that far off if you're the organised type!
You can save even more if you need a lot of cards, as when you buy Pre-Pay Moonpig Credit for £5 or more you save 25%. You can use the pre-pay credit immediately so it can be combined with the BOGOF!
Thanks to penninehopper @ HUKD