Just check coupons out (with price alert and history). Best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
| Image | Product (link) | Price | Coupons |
|---|---|---|---|
 |
Foldable Handheld UVC Disinfection Lamp Sterilization Folding Ultraviolet Light Travel Camping Car Home Germicidal Sterilizing | $15.10 | – |
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Voltage USB 5V Current: 400mA / 4AAA battery 6V Current: 450mA, Irradiation intensity >2500uw / cm2., UV-C tube 2W, Weight 65G, Battery 4* AAA / 6V (excluding battery), Size 125 * W35 * H25 mm., UV wavelength UV-C (253.7nm).
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($8.18): Cuponation9
2. ($8.45): BG00c906
you should apply the coupon 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/5cd
Old coupons (from the oldest to the newest): BGUVLIGHT2, BGSJDJP, BGHOMEG12, BGHDYJP, BGSDDJP, BGDCCJP, BGXZDHJP, BGSSJDVJP, BGSCXDDJP, BGTLJJJP, BGHome15%, BGHOMEA15%, BGAFF10OFF, BGCuponation10, 13f142, BGHONEY2110, BANGGOODSD, 00c906, BGAlerabat1, Terence, Tabby20, 2203ActiesNL, BG1efeb0, 8Couponsde, MVC8SPRING, BGJUNEGSG9, BG576bde, 9OFFSUMMER
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for UVC Handheld Folding USB Disinfection UV Lamp.
Price records source(s): 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)).