I have nine Zippy LiPos I use for my Strykers, they work great for me. HobbyCity carries them. If you buy 1kg worth of stuff from them, the express shipping is only a few bucks more, and you'll get your stuff in a week or less. Even with shipping, my 3S 2200mAh 20C packs come out to about $25 each. That's less than half what Horizon charges for a 3S 2200mAh 12C pack!