Aliexpress
Click here… to search for Niwalker ET2 XP-L HD Flashlight 21700 on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. Coupons for Niwalker ET2 XP-L HD Flashlight 21700? Nope, there’re no coupons in Banggood.
Link: Banggood product page
Price: -3 USD
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
Old coupons (from the oldest to the newest): FIN9885, BgoFErTaSchInA10, BGNRT3, bGhOnEy10, BgcLuBofErtA10, BGFLS15, 4BLF, BGAFF10OFF, BGCuponation10, BG10OFFAFF, BGwhielabel, BGflashlight, BGdeals76, BG10OFFAFF1, BANGGOODSD, BGTorch4, 00c906, BGtorch2, BGtorch3, BGAlerabat15, BGtorch7
(these coupons are old, so probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for Niwalker ET2 XP-L HD Flashlight 21700.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).