Mosquito Bite Helper (Banggood, Aliexpress: Weight: 80g, Color: Cool Black, Battery: 1x AA Battery (Not Included), Material: ABS, Size: 160x 29mm / 6.3″x 1.14″, Rated Voltage: 5V (the best price with coupon)).
Go down and check coupons out. Remember to check price history if it is available. Do you want to know what the best price is?
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 and price update (UTC):
Banggood
Banggood warehouse is located in China. You can get coupon down below.
Link: Banggood product page
1. ($8.09): AFfbG10
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): 684fa7, e2bcea, TTxBG10, 2019SPEDM, BGITCH544, 502C6B, BGBFAFF2019, BGCITYADS2019, BGBGHFRI15
(these coupons are old, so probably won’t work)
Price history and price alert
Check out price history chart (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)).