4"x4" Green Ink on White Vinyl Sticker.
It's weather proof, and the inks won't fade, even if you use it as a bumper sticker.
If you're just buying stickers:
Domestic Shipping is a flat $5, but now come with tracking and in a stay flat envelope. Order multiple stickers and the price will stay the same.
International Shipping is $3 + .25 for every extra sticker added. I'll try fitting as much stuff into an envelope for you. Otherwise it'd be $13 and up depending on where you're at.