Aliexpress
Click here… to search for Astrolux SM10 Bike Taillight with SL01 Front Flashlight on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. Only one coupon available!
Link: Banggood product page
Coupon (56.11 USD): BGCAPITALOS8
(CouponsFromChina.com tip: you should apply the coupon 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): FIN4819, BGOutlight10, BG589b2e, BGSCHOOL8OFF
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for Astrolux SM10 Bike Taillight with SL01 Front Flashlight.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).