Again, I offer black & white and color versions of the bumper stickers. You can use these to promote yourselves. I am doing this to help promote my website. I can order them one at a time through Zazzle and I will order one for anyone willing to display one on their bumper. It is a relatively cheap form of advertising. In my book, cheap is good.
If you go to Zazzle, you will see that I have several Good Day Bikes bumper stickers. These could be customized to promote your shop or club.