Aliexpress
Click here… to search for XDUOO X20 Portable Bluetooth Music Player on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. I found coupon for you. Check this out.
Link: Banggood product page
Coupon (247.29 USD): 7d18f7
(CouponsFromChina.com tip: this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): e2bcea, elec, 2019SPEDM, AFfbG10, BGBFAFF2019, BGCITYADS2019, BGE13, BMPlayers, BGVDay10%off, BGAFF10OFF, bGhOnEy10, Email5, BGSS10%SW, bgshOOp10, BGELIG0920, BG11SHOP, BG11PP12
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for XDUOO X20 Portable Bluetooth Music Player.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).