Aliexpress
Click here… to search for Astrolux WP2 with Astrolux WP1 Flashlights with 21700 Battery on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (335.99 USD): FIN4264
Coupon (366.04 USD): cbrIDgTec
(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): BGCuponation10, FIN1826, BGLEPSET
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for Astrolux WP2 with Astrolux WP1 Flashlights with 21700 Battery.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).