Aliexpress
Click here… to search for 11Pcs Replacements for Roborock Xiaowa Vacuum Cleaner on Aliexpress
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
Coupon (20.39 USD): 2022ACTIESNL
Coupon (20.61 USD): BG00c906
(CouponsFromChina.com tip: 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
Old coupons (from the oldest to the newest): BG11PCSREP, aff7off, BGALLPAT, BGaDmITAd, bgchinafest, BGBFAFF2019, BGCITYADS2019, bGpAnDacHeCk, 2020CNY, BGVDay10%off, BGHOMEAPP, BGMPB2020, bGhOnEy10, BGAFF7OFF, BGSS10%SW, bgshOOp10, BGHome15%, BGHOMEAPP13, BGHOMEA13, 13f142, BG10OFFAFF, BGwhielabel, BG10OFFAFF1, BANGGOODSD, 00c906, ADMITAD2212
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Price history (for all/most countries) for 11Pcs Replacements for Roborock Xiaowa Vacuum Cleaner is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).