I have just checked coupons. The lowest price I could get is 12.99 USD for GT13 Plus Mini (in Banggood). Go down and check coupons out. Remember to check price history if it is available. Let’s see what best price is ATM.
Latest coupon and price update (UTC):
Banggood (12.99 USD)
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database. Price? Current price is the lowest in history (according to CouponsFromChina database)!
Link: Banggood product page
Price: 12.99 USD
12.99 USD – This is the best price ever noted in my database!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BG589b2e, BGd57765
(probably won’t work, but you can try them out)
Aliexpress
Click here… to search for GT13 Plus Mini Keychain Flashlight on Aliexpress
Here are coupons that you can use.
Price history and price alert
Price history (for all/most countries) for GT13 Plus Mini Keychain Flashlight is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).