Just check coupons out (with price alert and history). Do you want to know what the best price is?
Battery Quantity: 1x 3.7V 21700 Li-ion, Max beam distance 256m, 9.5 days sustainable illumination
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. Well, there is one coupon available right now.
Link: Banggood product page
1. ($67.99): BGSM30%
apply it in your 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/5cd
Old coupons (from the oldest to the newest): 84dad0, FLSTNE, MTR15, M4BG, FMBG, BGTORCH, BGSPR, BGFITORCHSS
(these coupons are old, so probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for Fitorch MR15 Flashlight.
Price records source(s): Gearbest, 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)).