Ozone tube size: 255x 30mm, Application area: 61m ^ 2 and above, Function: Removal of formaldehyde / sterilization / Add Oxygen, Air Volume: 151-300 cubic meters / hour, Power Source: AC, Power: 55W, Scope: For Home purifier equipment / air purification machines / household appliances and other business equipment, Power Dimensions: 150x 52x 40mm, Input voltage: 220V, Product Category: Air Purifier.
Basically copy coupon, view price history or create e-mail price alert. What is the best price?
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. There are no active coupons for this product, but the price is pretty low isn’t it?
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!
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BG6e9bba, pROMo8cuPoN, BG00c906, BGJUNEGSG9, Cuponation9, BG8ReviTrage, BGeaf456, TTBLACK5, BG589b2e
(there’s a little possibility that old coupon will work)
Price history and price alert
Price history (for all/most countries) for AC 220V 7.5g Ozone Generator Tube 7.5g/hr is here. The lowest price was: $18.99.
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)).