Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (29.70 USD): BGAFF10OFF
Coupon (29.70 USD): bGhOnEy10
Coupon (29.70 USD): BGdragonBoat
Coupon (29.70 USD): BgoFErTaSchInA10
(CouponsFromChina.com tip: just apply this code in your 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): BGSE2205, TTxBG10, BGDYS2205, affbg10, BGCITYADS2019, AFfbG10, BGVDay10%off, BGMPB2020, BGSS10%SW, bgshOOp10, BGRC902
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Price history (for all/most countries) for DYS SE2205 2300KV 3-5S One Pair RC Motor is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).