The out-of-pocket amounts are based on the discount percentage of the product. If the overall price you pay increases, the out-of-pocket price will increase as well. Same applies to if the overall price you pay decreases - The out-of-pocket amount will decrease too.
Example:
The website has a mattress with the following details:
Product Price - $200
Coupon Value - $50
Discount - 90%
Out of Pocket Cost (10% of the post coupon price) - $15
Upon checking the listing, you notice that the clipped coupon is no longer available. Since the out-of-pocket amount is based on a fixed discount percentage of the price you pay, the new details would be as follows:
Product Price - $200
Coupon Value - $0
Discount - 90%
Out of Pocket Cost - $20