The last time I was at Joann's I told the lady at the register that I wanted to use all of my coupons (I had 3) and could she ring me up 3 seperate times. She said that as long as the numbered coupon code on the bottom is different in the last 3 numbers she could use them in the same transaction. I had no idea. And it seems like most times the 3 numbers are different.
Just wanted to share in case I was the only one not "in the know"!