Aliexpress
Click here… to search for BETAFPV TWIG XL 2-4S 12A Drone BNF on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (213.57 USD): BGGAL8
Coupon (213.57 USD): BGJON8
(CouponsFromChina.com tip: 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
Old coupons (from the oldest to the newest): BGRC902, BgoFErTaSchInA10, bGhOnEy10, BgcLuBofErtA10, BGAFF10OFF, BG10RACING, BGCuponation10, 7bcdf9, BGDAVIS, BGMATT7, BG789d51, BG4da62e, Drones6, BANGGOODSD, CouponsDE, 00c906
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Here is price history (for all/most countries) for BETAFPV TWIG XL 2-4S 12A Drone BNF.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).