Aliexpress
Click here… to search for 4 pcs. HGLRC Aeolus 2306.5 6S/1900KV 4S/2550KV RC Motors on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in Hong Kong.
Link: Banggood product page
Coupon (77.27 USD): BGMatt2022
Coupon (77.27 USD): BGToys8
Coupon (77.27 USD): JanBGCoupon8
(CouponsFromChina.com tip: you should apply the coupon 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): BG31d51b, Parts8, BG6cc953, BGRACING1125, BGGAL8, BGJON8, BGRCParts8, BGe3294e, BgGoodie9, Cuponation9, BGGutscheine, BG8OFFCOUPON, TTBLACK5
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Here is price history (for all/most countries) for 4 pcs. HGLRC Aeolus 2306.5 6S/1900KV 4S/2550KV RC Motors.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).