Aliexpress
Click here… to search for 13Pcs Parts for Roborock S6 S5 E35 E2 Vacuum Cleaner on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. I am tired of searching coupons, but I found one for you…
Link: Banggood product page
Coupon (14.43 USD): BG00c906
(CouponsFromChina.com tip: apply code in your basket (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): BGXM13PCS, bGpAnDacHeCk, BG13PCS, BGHOMEAPP, BGTT10, bGhOnEy10, BGAFF7OFF, BGSS10%SW, bgshOOp10, BGHome15%, BGHOMEAPP13, BGHOMEA13, 13f142, BG10OFFAFF, BGwhielabel, BG10OFFAFF1, BANGGOODSD
(probably won’t work, but you can try them out)
Price history and price alert
Check out price history chart (for all/most countries) for 13Pcs Parts for Roborock S6 S5 E35 E2 Vacuum Cleaner.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).