A suggestion. I'm sure you've heard some people claim that it's a bit late in the game for the focus of some of the stickers, but I think you have a really good idea going, not only with product/price, but with the layout of the site.
I don't know who your printer is, but I would definitely not get discouraged should you not see the returns you expect. As your site is politically themed (no really? I couldn't tell, honest.
), there will be a lot of opportunity in the future for you to take advantage of what you have set up, regardless of who wins the election. I think there are a number of companies that pop up in election years, that are not heard from again, because they work only on the election stuff. However there is a huge market in general these days for political statement stickers. That base is even larger if you run two sites on the same cart engine, with each one catering to different sides of the fence. That is an ethics thing though.
If you can keep the prices as low as they are, without undercutting yourself, there is a lot of potential.
Heck, if you designed the site on your own, get the guts of it together, and sell the template.