Weight: 80g, Color: Cool Black, Battery: 1x AA Battery (Not Included), Material: ABS, Size: 160x 29mm / 6.3″x 1.14″, Rated Voltage: 5V.
Basically copy coupon, view price history or create e-mail price alert. Let’s see what best price is ATM.
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
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. One coupon is available. Cool!
Link: Banggood product page
1. ($8.09): AFfbG10
apply it in your 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/i1u
Old coupons (from the oldest to the newest): 684fa7, e2bcea, TTxBG10, 2019SPEDM, BGITCH544, 502C6B, BGBFAFF2019, BGCITYADS2019, BGBGHFRI15
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for Mosquito Bite Helper. The lowest price was: $5.44.
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)).