1x Vacuum Cleaner Hepa Filter.
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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.
Link: Banggood product page
1. ($4.58): 12blitzw
2. ($4.73): od7off
coupon code has to be applied in shop’s cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): aff7off, vipupgrade8, e2bcea, 502C6B, 1225CAR, bgsport, Accessories, BGss10%bw, bGpAnDacHeCk, 2020CNY, BGVDay10%off, BGBlitzFB, bGhOnEy10, BGBW152, BGAFF7OFF
(I don’t think these’re gonna work, but you can try ’em out anyway)
Other warehouses/versions
This item is available in 4 another warehouse/versions!
1. China – Blitzwolf 4x Side Brush Vacuum Cleaner Replacement ($-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
Do you need price history chart (for all/most countries) for Blitzwolf Hepa Filter Vacuum Cleaner Replacement? There we go. 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)).