CafePress has some good ones too: http://www.cafepress.com/cp/search/s...___P___b7_a2_H

The Hen is rather internet-illiterate, so she told me it was my duty to post links. It's been pretty funny finding biking bumper stickers for her. The conversation usually went something like this:

Me: Hey, Mom, look at this sticker. Isn't cool?
Her: How did you find that? I searched forever and didn't find a thing.
Me: I used Google.
Her: Stupid Google. I can't even spell Google. And all it turns up is useless crap.
Me: Yeah, but I found your stickers.
Her: *mutter and walk away*

I love the internet