Aliexpress
Click here… to search for Magicshine Allty 300 Mini 300lm USB Bicycle Light 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 (18.53 USD): BGOutlight10
Coupon (19.16 USD): Cuponation9
Coupon (19.38 USD): BG8ReviTrage
(CouponsFromChina.com tip: coupon code has to be applied in shop’s 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): BG110729, 8wEbgaInS5, pROMo8cuPoN, BG71c041, BGbhlight01
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Do you need price history chart (for all/most countries) for Magicshine Allty 300 Mini 300lm USB Bicycle Light? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).