Just check coupons out (with price alert and history). Let’s see what best price is ATM.
DSD 256 native reply direct recording, Long-lasting 900mAh battery
Aliexpress
There’re some similar (or not) items on Aliexpress
| Image | Product (link) | Price | Coupons |
|---|---|---|---|
 |
New 3.7V 950mAh Li-Polymer Battery For xDuoo NANO D3 Replacement Accumulator with 2-Wire Plug + Free Tools | $11.62 | – |
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. Too bad there’s no coupon right now in Banggood.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): aff7off, e2bcea, elec, 2019SPEDM, AFfbG10, BGBFAFF2019, BGCITYADS2019, BGE13, BMPlayers, BGVDay10%off, BGAFF10OFF, BGTT10, bGhOnEy10, Email5, BGSS10%SW, bgshOOp10, BG11SHOP, BG11PP7, 7d18f7, 13f142, BGCuponation10, BGBuscape01, BG651551, BGBRPL2, BGHOTSHOP15, BG53e9c8
(these coupons are old, so probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for XDUOO Nano D3 Music Player.
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)).