Have you ever sold T-shirts?

Yeah, right? Especially when you consider that a) typical retail markup is 100-200%, b) Shopkeeper/Designers get 10% while affiliates get 15% (WTF) and c) you could print your own shirts for a few bucks and turn the rest into revenue. $1.80 is not easy to commit to for long.

Oh, and by the way - Google sends searches to Cafepress' main marketplace and not to the individual shopkeepers pages. In essence, CP stopped sending traffic to shops and now mixes individual designs all together. If you want traffic to your shop, you have to get it yourself.

Yeah they pretty much pissed off their own production base.

In other words - if you have to do all the marketing yourself anyway, may as well spend $5 per unit (or whatever) and sell for $18. Also, you can offer a much wider print area than CP does, which is limited to a chest sized area front and/or back; or left breast pocket.

Still I won't complain - the tees I made are still sending me the occasional check and I haven't touched the site in years. I still recommend it for beginners since they have a well-established community that will help tremendously with the Tshirt business learning curve. This is gold.

So ok I would recommend Zazzle and Cafepress, and your own garage print shop.
Printfection is another option, though none of my designs ever sold there.

Oh, one more - if you're really artistically gifted, you definitely want to check out Redbubble. They also do bang-up framing work for art prints.

The T shirt business is really fun, did I mention that? Just don't wait for rent. You can get there eventually but do not hold your breath. I would add that any kind of offline campaigning/networking you can do can be much more effective marketing than crowded online tee marketplaces. Beat the grass.