16 pcs. Vacuum Cleaner Parts Roborock S50 S51 S5 MAX S6 1S [EU] (Banggood, Aliexpress: 4x HEPA Filter, 4x Main Brush, 8x Side Brush (the best price with coupon)).
You can create price alert here, copy coupons and view price history. You probably want to know what is the best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in Europe 
. I don’t want to misguide you about the price. I don’t know if it’s good, because I don’t have enough records in my database… I found coupon for you. Check this out.
Link: Banggood product page
1. ($22.61): BGAHPU13
coupon code has to be applied in shop’s 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): BG16PCSES, BGHOMEA13, 13f142, BG10OFFAFF, BGEFDRSV, BGwhielabel, BG10OFFAFF1, BGe99602, BGd4fb13, 00c906, BGPT0127, BG00c906, BGJUNEGSG9, Cuponation9
(there’s a little possibility that old coupon will work)
Price history and price alert
There is only one database record (it was for $18.99), 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)).