It is nice of renderosity to try out the triple linked coupon idea but I am not sure how much product testing was done before its release. Trying to use the first one really brought home to me that most items, (and particularly any with percentages off) seem to be invalid for coupon codes now.

TBH a colour code on each item to show that a code is actually usable is needed, more than the red ticket to show it is not. Often I clicked on products with blue links that then turned out to have red tickets further in