$18.99 – JSD-520 Bluetooth Car Audio Player (Banggood, Aliexpress: MP3 / WMA / APE / FLAC / WAV, Preset 18 stations (frequency: 87.5-108 MHz), Bluetooth Specification：V2.0 (the best price with coupon)).
Latest update shows that JSD-520 Bluetooth Car Audio Player costs $18.99 (in Banggood). You can create price alert here, copy coupons and view price history. Let’s see what best price is ATM.
Latest coupon and price update (UTC):
Banggood ($18.99)
Banggood warehouse is located in China. I can’t find any active coupons for this product in Banggood. Good or bad price? Hmmm, price is higher than average (which is $17.99 right now), so better set price alert down below…
Link: Banggood product page
Price: $18.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGSCM11, BGCarEle5, BGLMQ15, BGAMMT03
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Aliexpress
There’re some similar (or not) items on Aliexpress
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)).