Items like t-shirts, mugs, mouse pads and calendars are traditionally among the more expensive items to produce because of manufacturing costs. However, a service like Cafepress or Lulu.com, where items can be manufactured on an “as-ordered” basic, makes this much more viable. And you can drive sales straight to your Cafepress “store”, right from your website.
If you have a great logo or graphic, this may be the way for you to go. For more ideas on this topic, read the rest of my free newsletter at The Great Ideazine.