If you look at the website of Cafepress.com, you will see what I am talking about. Basically you upload a picture or saying and attach it to an item (t-shirt, mug, clock, etc.) It costs nothing but time to do it. Then you set the price and the items are not made until someone orders it online. There is no inventory, no overhead, etc. etc.
Everything is handled through the website. Further questions, e-mail me or check out my personal store located at Mentzer's Tower of Merchandise
I found a site that has a shirt with a picture of Sidney Toler on the front and the caption "What Would Charlie Chan Do?" on Ebay. There were two. I bought one. :)