$21.99 – MP3 / WMA / APE / FLAC / WAV, Preset 18 stations (frequency: 87.5-108 MHz), Bluetooth Specification：V2.0.
I am monitoring price for JSD-520 Bluetooth Car Audio Player and it is for $21.99 now (in Banggood). You can create price alert here, copy coupons and view price history. Best price?
Latest coupon code price check (UTC time):
Banggood ($21.99)
Banggood warehouse is located in China. There are no coupons for this product in Banggood. The question is – is it a good price? From what I can see this price is higher than average price ($17.99).
Link: Banggood product page
Price: $21.99
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGSCM11, BGCarEle5, BGLMQ15, BGAMMT03
(probably won’t work, but you can try them out)
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Check out price history chart (for all/most countries) for JSD-520 Bluetooth Car Audio Player. The lowest price was: $17.99.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).