...in fact, I used 6 of them with no problem. I'm handling the 8th grade graduation party for our very small private school, and at the last minute, K-Mart backed out of donating 18 disposable cameras for the kids to use at the party. Since the party budget wouldn't accomodate the cameras, I was going to pay for them myself, which was going to be hefty. But, I printed out the coupons, called Staples and explained the situation, and the manager told me to bring them in. I had to do a separate transaction for every 3 cameras to use the coupon, but that was not a problem. Because of the generosity of the manager, and the good folks on this board, I was able to buy 18 disposable cameras (27 exposure, with flash!) for a grand total of $11.10. Fits into my budget much better than it would had I paid $5.99 each (or more) at Wal-Mart. Thanks for the heads up!!!! Also, the cashier had to punch a coupon code from the coupon itself. The first time, she punched in an incorrect digit, and it rejected the coupon. When she did it over, it went through fine. So, I think that if the coupon were invalid, the computer would not have accepted it.