I know the shops can be set up to make a profit by raising the price but I'm not sure what the current breakeven prices are. They are probably the prices in the NOG store.
Cafepress does have set sizes but you can pick what items you want to sell and somewhat choose the logo size... at least one used to be able to. I haven't set up a shop in years and the ones I did were temporary for events.
It's nice we can still buy Fiberglass RV item if we desire.
I have one of Roy Massen's Boler
hats and I love it!