Aliexpress
Click here… to search for Xiaomi Huohou HU0034 Knife Sharpener on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. There are no coupons for this product in Banggood.
Link: Banggood product page
Price: -3 USD
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Old coupons (from the oldest to the newest): 502C6B, vipupgrade8, 799HUOHOU, TTxBG10, BGHU0034PL, aff7off, BG755shar, bgssaff9, AFfbG10, affbg10, BGBFAFF2019, BGCITYADS2019, BGVDay10%off, BGHOMEG12, BGTDDH5, BGMPB2020, bGhOnEy10, BG8852HUO, BGdragonBoat, BGSS10%SW, bgshOOp10, BGHome15%, BGOCFR295, BGHOMEA15%, BgcLuBofErtA10, BGAFF10OFF, BGJATD295, BGJAFO295, BGCuponation10, 13f142, BG10OFFAFF, BGMAYTD295, BGwhielabel, BG10OFFAFF1, BANGGOODSD
(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 Xiaomi Huohou HU0034 Knife Sharpener is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).