Aliexpress
Click here… to search for Xiaomi NINESTARS DZT-8-29S Smart Trash Can 8L on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. So I have checked for active coupons (all category coupons and old ones), but there was no working coupon 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): 48330c, TTxBG10, BGTRC15, 2019SPEDM, bgssaff9, AFfbG10, BGBFAFF2019, BGCITYADS2019, BGHOMEG12, BGMPB2020, BGAFF10OFF, bGhOnEy10, BGdragonBoat, BGSS10%SW, bgshOOp10, BGHome15%, BGHOMEA15%, BgcLuBofErtA10, BGCuponation10, BGHONEY2110, BG10OFFAFF, BGwhielabel, 13f142, BG10OFFAFF1, BANGGOODSD
(these coupons are old, so probably won’t work)
Price history and price alert
Do you need price history chart (for all/most countries) for Xiaomi NINESTARS DZT-8-29S Smart Trash Can 8L? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).