I ordered one 2000mAh 3.7v 103450 battery from AliExpress from a seller that had 1,000+ sold, and honestly I don't think I'm getting it, but now that I ordered it, I realize maybe I should've bought 3 or 4 to increase my chances of it coming in the mail....but if I can't get this one...will I get 5? Which led me to ask.

Where are you getting your small LiPo batteries? I'm working on a project where I need it to be thinner than an 18650 (I've got quite a few of those), but since I'm in the US, where can I dependably order from?