Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. Only one coupon available!
Link: Banggood product page
Coupon (144.50 USD): 8Couponsde
(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): 502C6B, PICODICOM, 2019SPEDM, aff7off, bgssaff9, BGaDmITAd, bgchinafest, BGBFAFF2019, BGCITYADS2019, Email5, BGHOMEAPP, BGMPB2020, BGSLOVN, bGhOnEy10, 7bcdf9, BGSS10%SW, bgshOOp10, BGHome15%, BGHOMEAPP13, BGHOMEA13, BGCuponation10, BG10OFFAFF, BGwhielabel, BGYY001, BG10OFFAFF1, BANGGOODSD, BG1111KA, BGBFKA, 2022ACTIESNL, Terence, Tabby20, BGKAMAR20
(probably won’t work, but you can try them out)
Price history and price alert
Price history (for all/most countries) for Xiaomi SOLISTA 12L 800W Electric Oven is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).