Aliexpress
Click here… to search for 4Pcs Racerstar AirB 2514 1498KV 4-8S RC Motor on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. One coupon is available. Cool!
Link: Banggood product page
Coupon (66.14 USD): BGHONEY2110
(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): BG4BM, AFfbG10, BG12MRP, BGBFPART1, BGBF, BGCITYADS2019, BG12ABM, BGWKAirB, BGBBM, BG2514Motor, BGGEPPart, BGHJW8, BGVDay10%off, BGZHF3, BG44VVE, bGhOnEy10, BGAirBCL, BGSS10%SW, BGAirB4, BgcLuBofErtA10, BGAFF10OFF, BGCuponation10, BGDAVIS
(probably won’t work, but you can try them out)
Price history and price alert
Here is price history (for all/most countries) for 4Pcs Racerstar AirB 2514 1498KV 4-8S RC Motor.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).