I have been known to purchase an item with my 40% off coupon, take it to the car and return to purchase another wanted item with a 2nd coupon. When I have to drive nearly 50 miles to a JoAnn's, gas is more than $3.40b/gal, and they won't accept Michael's coupons or honor my 20% off the entire purchase -- even though the FINE PRINT says it applies to sale and clearance items, I feel justified.
I check my sales receipt like a hawk before leaving the store, since I have found frequent pricing errors -- all to their benefit. I've been charged for one article twice, been charged for something I didn't purchase and/or been charged the regular rather than the sale price.
Google JoAnn's coupons. I can usually find a 20% off the entire order coupon using this method. Recently I've noticed that when I print the 40% off coupon from JoAnn's website, my last name appears on the coupon. What's up with THAT?