I'll help you out: that battery is shit and it won't deliver anywhere near the rated capacity even at 0.2c guaranteed.
Ebiking puts a moderate demand on 18650 cells even on a lightweight, low power kit. You need decent cells, and they don't come at the price that makes a pack of that capacity anywhere close to possible at $99 retail. Even if the company is losing as much money as Tesla they can't get the price that low!
http://www.best18650battery.com
Go there and look at the cells with at least 20 amp discharge capability. Then look up those cells on websites like imrbatteries.com (decent quantity pricing from a US supplier) where you can buy the batteries to see what the prices are. Then, you can have an idea of what a pack will cost if you pay someone a couple hundred bucks to put together a pack and ship it to you. That price may vary wildly depending on who is willing and able to make a pack at the moment you're in need.