Discharge Plug: XT60, Discharge Rate: 150C, Dimensions: 78mmx 39mmx 42mm (Lx Wx H), Configuration: 6S1P / 22.2V / 6 Cells, Minimum Capacity: 1400mAh, Charge Plug: JST-XHR, Max Burst Discharge Rate: 260C, Net Weight(±20g): 222g.
Just check coupons out (with price alert and history). Let’s see what best price is ATM.
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
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. ($49.72): BGToys8
2. ($49.72): BG8OFFCOUPON
3. ($49.72): TTBLACK5
coupon code has to be applied in shop’s cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): Cuponation9, BGGutscheine
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for Tattu R-Line Version 5.0 22.2V 1400mAh 150C 6S1P RC Battery XT60. The lowest price was: $42.99.
Price records source(s): 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)).