I just bought a 64MB SanDisk CompactFlash card @ Staples B&M for $78, and now I realize I could have pricematched to an online store and gotten it like $10 cheaper. Can I go back and have them match the price? The other problem is, I used a $15 off $100 coupon, what happens to that if the final total after pricematch goes under $100? Do I have to give them some money?