Aliexpress
Click here… to search for 4Pcs Racerstar AirA 2508 BP Edition 4-5S 1700KV RC Motor on 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 (82.79 USD): TTBLACK5
(CouponsFromChina.com tip: this code has to be applied 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): BGBP1700, BGRC902, BGCQMP15, BgoFErTaSchInA10, bGhOnEy10, BGHALLOWEEN, BgcLuBofErtA10, BGAFF10OFF, BGCuponation10, BGDAVIS, BGHONEY2110, Parts8, BGfd7243, BG2e2946, BGGAL8, BGbf983a, BGJON8, BGRCParts8, Tabby20, BG1efeb0, tRaDetRaCKeR, 8wEbgaInS5
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Do you need price history chart (for all/most countries) for 4Pcs Racerstar AirA 2508 BP Edition 4-5S 1700KV RC Motor? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).