Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. There is one great coupon!
Link: Banggood product page
Coupon (233.90 USD): BG8ec602
(CouponsFromChina.com tip: put item in your cart and apply coupon code there 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): AFfbG10, BGMPB2020, bGhOnEy10, BGdragonBoat, 367835, 9ff017, bgshOOp10, BGODFNJ1, BgoFErTaSchInA10, BgcLuBofErtA10, BGHBHJ106, BGAFF10OFF, BGCuponation10, 7bcdf9, BGHONEY2110, BG10OFFAFF, BGwhielabel, BG10OFFAFF1, BG4d9120
(these coupons are old, so probably won’t work)
Price history and price alert
Price history (for all/most countries) for Yunmai Handheld Deep Fascia Massage is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).