I ordered some of the little BT adaptors to play audio in the car. They work like they're supposed to.
Wow, you thought those things were cheap? So, you don't know much about China. Another similar China-based website is named Tinydeal.com. You just need to have a look at the links below to know more about the outside world. Have a comparison.
USB Sound card:
I'm not the boss the this company, so I don't wanna show more of its products. You can compare more products if you wish.