$7.99 – 5pcs Replacement Parts for Mijia Roborock Vacuum Cleaner (Banggood, Aliexpress: 1x Main Brush, 2x Side Brushes, 2x HEPA Filters (the best price with coupon)).
I have just checked coupons. The lowest price I could get is $7.99 for 5pcs Replacement Parts for Mijia Roborock Vacuum Cleaner (in Banggood). You can create price alert here, copy coupons and view price history. Let’s see what best price is ATM.
Latest coupon and price update (UTC):
Banggood ($7.99)
Banggood warehouse is located in China. There is no active coupon in my database right now (for Banggood). Is it expensive? Good news! This is great price, coz it’s the lowest in CouponsFromChina database!
Link: Banggood product page
Price: $7.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/feV
Old coupons (from the oldest to the newest): BG63af64, Cuponation9, 9OFFSUMMER, BGAHPU13, BG00c906, BGeaf456, BG589b2e
(I don’t think these’re gonna work, but you can try ’em out anyway)
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.
Price history and price alert
Here is price history (for all/most countries) for 5pcs Replacement Parts for Mijia Roborock Vacuum Cleaner. The lowest price was: $7.99.
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)).