People are extremely whacky these days. I had a woman come in today and throw a $5 bill on the counter for a $16.99 plus tax item. When my daughter told her the price, (which was clearly marked), she flipped out and made a horrible scene in the store! "Why that price is ridiculous!! This is not worth more than $5.00" blah, blah, blah. The item cost me $9.50 wholesale plus shipping!!! I think I would have shoed her to the door and told her to shop at the dollar store up the road if I'd had been there. I'd tell that woman, if she was stupid enough to send you payment in a form that you don't and haven't accepted, she can pay to cancel the check, period.