Those places, (Banggood, Deal Extreme, etc) often take a month or even more from the time you order, until the package arrives. I think they typically come over via container ship. Hopefully your job and car will last at least until the package arrives.
I've never bought from Banggood, but I've bought a number of things from Deal Extreme. The quality is OK. I had one flashlight from an order of 6 that didn't work. But it was a $2 flashlight, so I didn't contest it. I recently bought a watch from DX, and liked it so much I bought 3 more, (for when the first one inevitably breaks). The total cost for all 4 was under $25.