If you go through Joanns.com there is a link (I think on the home page) for 50% off one item, when you click on it a little window pops up with a code. The code will take 50% off of the REGULAR price of the most expensive item in your cart, even if it's on sale I guess (that's what it did in mine).
I didn't get the Once Upon a Time Stack because I couldn't justify it right now, but it sure is gorgeous.