Just check coupons out (with price alert and history). Let’s see what best price is ATM.
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
UV Wavelength 253.7nm, Rated Power 55W, Product Size 27.5*64CM, Work Time 0-120mins
Banggood
Banggood warehouse is located in Europe 
. I don’t know if this is a good price – number of records in my database is too low! You can get coupon down below.
Link: Banggood product page
1. ($92.11): BG589b2e
this code has to be applied 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): BGfc5f04, BG75597c, BGcb58fc, BG27a062, JanBGCoupon8, BGSaleFeb8, BGSaleAD, BGgh0413j, BGMARCHSALE
(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
There is only one database record (it was for $28.99), so you can’t see price history chart.
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)).