Price history, coupons and price alert are available on this page. Let’s see what best price is ATM.
1x OPP Bag, Package Contents: 1x Whistle
Aliexpress
There’re some similar (or not) items 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. I’m afraid that there’s no working coupon 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): f383d7, BGIPRee12, AFfbG10, 502C6B, BGBFCR21, BGCITYADS2019, BGVDay10%off, BGIPREEB, BGAFF10OFF, bGhOnEy10, BGdragonBoat, BGCAMP01, BgoFErTaSchInA10, BgcLuBofErtA10, BGZPBC15, BGTY704CP, BGHONEY2110, BG10OFFAFF, BGwhielabel, 13f142, BG10OFFAFF1, BG4d9120
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Here is price history (for all/most countries) for Aluminum Alloy Whistle.
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)).