This looks really cool! I would definitely raise your pricing, if you want to stay in the single-digits then $8 (or even $7) would be great. I'd also look into formalizing your team sticker offer: 10% off for orders over 5x or something along those lines.
Edit: start hawking these at conferences. You'll make bank. Also, bookmarked to order in a few days when I get paid.
Edit: start hawking these at conferences. You'll make bank. Also, bookmarked to order in a few days when I get paid.