Aliexpress
Click here… to search for DJI 11.4V 1480mAh Battery on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. Well, there is one coupon available right now.
Link: Banggood product page
Coupon (47.62 USD): AFfbG10
(CouponsFromChina.com tip: apply it 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, TTxBG10, BGss506
(there’s a little possibility that old coupon will work)
Price history and price alert
Check out price history chart (for all/most countries) for DJI 11.4V 1480mAh Battery.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).