Wow, now that's some big support! I have a comic shop (fortunately) I'm good friends with them, and my local jewelry store has a cafe next door that they also own. I'm good friends with them as well. I plan on getting some exposure putting up some flyers there.
I also thought of printing up cards that I can pass out at malls, just anyone I meet.
I plan on having a book of strips published. After I do that, that's when I'm really going to be promoting.
Shirt prints are a good idea. Some of your characters on it with the url.