I appreciate the thought. I already had the server in place for other purposes so site expenses are pretty minimal. However, merchandise (ie. swag) has been brought up before and I just recently setup a cafeexpress.com account exactly for this purpose.
One of my bumper sticker prototypes:
I've got a few more in the pipe (including one of the site logo) and I hope to get them up for sale this week. The Cafe Express cost is $2.99 USD. I was thinking of charging $5; I don't want to be greedy. If that's too pricey let me know.