Blitzwolf Hepa Filter Vacuum Cleaner Replacement (Banggood, Aliexpress: 1x Vacuum Cleaner Hepa Filter (the best price with coupon)).
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
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.
Link: Banggood product page
1. ($4.58): 12blitzw
2. ($4.73): od7off
put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): aff7off, vipupgrade8, e2bcea, 502C6B, 1225CAR, bgsport, Accessories, BGss10%bw, bGpAnDacHeCk, 2020CNY, BGVDay10%off, BGBlitzFB, bGhOnEy10, BGBW152, BGAFF7OFF
(I don’t think these’re gonna work, but you can try ’em out anyway)
Other warehouses/versions
This item is available in 4 another warehouse/versions!
1. China – Blitzwolf 4x Side Brush Vacuum Cleaner Replacement ($-3)
2. China – Blitzwolf Filter Net Vacuum Cleaner Replacement ($-3)
3. China – Blitzwolf Remote Control Vacuum Cleaner Replacement ($-3)
4. China – Blitzwolf 4x Rolls Brush Vacuum Cleaner Replacement ($-3)
Price history and price alert
Check out price history chart (for all/most countries) for Blitzwolf Hepa Filter Vacuum Cleaner Replacement. The lowest price was: $4.24.
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)).