I firmly believe you can never have too many bike related items.
Microcosm Publishing in Portland, Oregon has some neat merchandise for sale through their website and in their new shop. The site has a search feature which allows you to search through only bike-related items. They carry bike tee's, bike zines, bike patches, bike pins, bike posters, etc..
They only print t-shirts on American made, fair trade, super SOFT and comfy shirts and are priced very reasonably at 10-12$.
The Chainring Heart shirt is my favorite.
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Cool stuff. I like the evolution and the fun between your legs shirts.