Okay. If I want more black t-shirts in one shop, I have to pay about 7 dollars a month to keep up the shop. Now, I wouldn't even sell that many tshirts to get those 7 dollars back in. Sure, I can create a new shop for each black tshirt I want to sell, but this doesn't look like a good solution.
For now, the cafepress idea is dead again. Maybe it will return later if I have any good t-shirt ideas.