I have bundled a couple of site from where you can buy parts and extra’s for your drone.
A great site, with local shipping when you are lucky.
I got my LiDi R/C drone from here, was delivered within a week
AliExpress is where I bought my UpAir battery.
They have a lot of stuff, and is different from Banggood and Gearbest.
AliExpress is a platform for sellers, whereas Banggood and Gearbest are shops with stock. AliExpress is just great for many, many things.
Hobbyking is great if you are only on the lookout for R/C parts and accessories. They offer a wide range of all sorts of parts.
Prices are very good! I have bought both my LiPo’s there for the battery mod.