from what I understand your purchase has to total at least the $10 or amount specified. It can be with multiple receipts as long as they total the amount. I would go buy something for a dollar or two and add it to it your total.
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I always just circle the price that it rings up on the receipt, not what I actually pay out of pocket,(since us cheapies NEVER buy anything without a coupon or a rebate! LOL) I do tons of rebates and have never had a problem...