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Click here… to search for Xiaomi DDYS01SKS Sonic Electric Toothbrush on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in Hong Kong.
Link: Banggood product page
Coupon (20.99 USD): BGb99492
Coupon (45.50 USD): Cuponation9
Coupon (46.00 USD): BG8ReviTrage
Coupon (47.00 USD): BG00c906
(CouponsFromChina.com tip: paste coupon code in your cart and click Apply 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, vipupgrade8, e78b34, 429469, TTxBG10, BGNew11, 2019SPEDM, BGMITO34, AFfbG10, BGMIBRUSH, BGMIJIATT, BGOE31, BGBFAFF2019, BGCITYADS2019, BGBGHFRI15, BGJIAMI32, BGOERTGN, BGVDay10%off, BGAFF10OFF, bGhOnEy10, BGHFNE39, BGdragonBoat, bgshOOp10, BgoFErTaSchInA10, BgcLuBofErtA10, BGZSDHWK34, BGBLACKFHK34, BGXIAOMITB34, BGCuponation10, 13f142, BGHONEY2110, BG10OFFAFF, BGwhielabel, BGMAR3109, BGJUN151, BG10OFFAFF1, BGISXP2704, BANGGOODSD, 6GSGIT, BGHealth06, 00c906, BGHealth10D, 2022ACTIESNL, BGHB218, BGXPMA310, BGXPAP247, BGXPMA035, tRaDetRaCKeR, BGHECARE1, BG4ee866, BGHOM013, BGd035dd, BG53ae9e, BGcefd0e, BG6038d2
(there’s a little possibility that old coupon will work)
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi DDYS01SKS Sonic Electric Toothbrush.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).