I've noticed more and more coupons are saying "limit 2 per transaction" for the same coupon. Though I'm not sure they beep at the register if you use more. I do know at least at my grocery the cashiers know P&G will only allow 4 like coupons in an order.
Roberta
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All of the store in my area will only accept 4 of the same coupon in one transaction. And a lot of times on their sale items, they print "limit 4" right in the sale ads. Otherwise you can try to get by with more.