You can create price alert here, copy coupons and view price history. Best price?
Capacity: 550mAh, Configuration: 3S1P, Voltage: 11.1V
Aliexpress
There’re some similar (or not) items on Aliexpress
| Image | Product (link) | Price | Coupons |
|---|---|---|---|
 |
2/5PCS High Rate Gaoneng GNB 3s 11.1V 550mAh 80C Lipo Battery XT30 JST Plug for RC Ca Lizard95 FPV Racer Quadcopter Racing Drone | $34.51 | – |
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($13.56): bGhOnEy10
2. ($13.56): BGdragonBoat
3. ($13.56): BGAFF10OFF
4. ($13.56): BgcLuBofErtA10
paste coupon code in your cart and click Apply after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): Charger12, BGCITYADS2019, AFfbG10, BGVDay10%off, BG10BC, BGBC1, BGRCBC7, BGSS10%SW, bgshOOp10, BGRC902, BgoFErTaSchInA10
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Price history (for all/most countries) for 11.1V 550mAh 80C LiPo RC Battery with JST XT30 is here.
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)).