Nut 2 Bluetooth Tracker Green (Banggood, Aliexpress: Intelligent Bluetooth Anti-lost Tracking Tag (the best price with coupon)).
Just check coupons out (with price alert and history). You probably want to know what is the best price?
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($12.77): BGAFF10OFF
2. ($12.77): bGhOnEy10
3. ($12.77): BGdragonBoat
4. ($12.77): BgoFErTaSchInA10
apply code in your basket (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/feV
Old coupons (from the oldest to the newest): 502C6B, CODE1573, vipupgrade8, TTxBG10, 2019SPEDM, bgssaff9, AFfbG10, aff7off, BGBFAFF2019, BGCITYADS2019, BGVDay10%off, BGHOMEG12, BGMPB2020, BGSS10%SW, bgshOOp10
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Price history (for all/most countries) for Nut 2 Bluetooth Tracker Green is here. The lowest price was: $2.99.
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)).