I just got a heads-up from Cafepress saying that they are going to start charging an additional $3 on shirts that have printing on both sides.
Therefore I am going to rework as many of the designs as I can to integrate the website addy into the main design so I can eliminate the second side and lower purchase costs. The only one I know offhand I don't want to change is the Familiar Shirt as I don't want to ruin the design by putting the website addy somewhere on it.