You can try www.buildasign.com too

They do custom stickers, decals and such. pretty cheap, no minimums and even free shipping. I think a single 3x10 bumper sticker of your own design will cost you 2.99

If you order 100 they are $1 each

I made was in the sign business for almost 20 yrs and my wife still is, but if I need a small cheap sticker that is not a huge rush it is cheaper and easier for me to use them

C.