Just check coupons out (with price alert and history). Best price?
Battery Capacity(mAh): 400mAh, Working Time: 4 – 6 Day
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. Too bad there’s no coupon right now in Banggood.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): e2bcea, BgAuMotor, b71c67, AM15prime, AMPrime01, BG7705, BGAutos, BGCS10, BGSP63, bGhOnEy10, BGCARELEC, BGCARPRO, BGGF074, BGAFF10OFF, BGCuponation10, BGb77b8b
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Do you need price history chart (for all/most countries) for GF07 Magnetic Tracking Locator? There we go.
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)).