Aliexpress
Click here… to search for 33 pcs. 1S S50 S51 S55 S5 S6 Vacuum Cleaner Spare Parts on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (28.25 USD): 8Couponsde
Coupon (28.25 USD): MVC8SPRING
Coupon (28.56 USD): 2203ActiesNL
(CouponsFromChina.com tip: this code has to be applied in your 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): BGwhielabel, 13f142, BG10OFFAFF1, BANGGOODSD, 00c906, ADMITAD2212, 2022ACTIESNL, BGAlerabat1, Terence, Tabby20, BG1efeb0
(these coupons are old, so probably won’t work)
Price history and price alert
Price history (for all/most countries) for 33 pcs. 1S S50 S51 S55 S5 S6 Vacuum Cleaner Spare Parts is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).