Actually, they will not let you do that here in California. The coupon states for regular priced items only. If an item is on sale already, you get the item at the already stated sale price only. I was just in Joann's today with friends and we were just laughing about trying to find something in the store that was NOT on sale. None of us could find anything that did not have a sale price on it, even the clearance items! Not to beat all, we went to Hancocks down the street and found that they are starting to do the same thing.
Not to mention have you noticed what Michael's Craft store is doing now? You can't get the 40% off coupon unless you spend a min of $5.00 and fill out the coupon to be on their mailing list. Granted I spend at least that, but I just think this is going a little too far in the restrictions.