How to generate traffic for Boy Scouts t-shirt sales

Hi everyone,

My son's troop is raising money for their winter and summer camps (this usually runs about $300-400/year). Their main, Boy Scouts-approved method is selling popcorn, but it's a tough sell as it's quite expensive - a lot harder to sell than those delicious Girl Scouts cookies!

So I've started a Cafepress store (called Funny Boyz) featuring t-shirt designs that primarily involve an animal plus funny captions - actually, my son comes up with them and I post them. Other boys in the troop are working on their designs to add.

Now I need to make sales. So my questions are:
1. Can I SEO a Cafepress store effectively?
2. Is Pinterest good for this type of thing. I haven't "done" Pinterest so really know nothing about how to promote stuff on it.
3. My other ideas, if anyone has further input or advice, are Craigslist, eBay classifieds, Squidoo and, of course, I'm already posting them to my personal Facebook page.

Winter camp payment is coming up soon so we don't have a bunch of time to "test" ideas - I'm trying to go for the jugular, so to speak!

Thanks a bunch!
Nancy