$37.94 – Brand Name: FMS, Usage: Suitable for RC Airplane, Motor: 2627 KV4500(4S)/ KV5400(3S) (Optional), Weight: 75g, Item Name: 50mm 11 blades Ducted Fan.
You can get FMS 50mm 11 Blades Ducted Fan EDF RC Motor for $37.94 using coupon code (in Banggood). You can create price alert here, copy coupons and view price history. You probably want to know what is the best price?
Latest coupon and price update (UTC):
Banggood ($37.94)
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database. You probably want to know if this is a good price. My database says that it’s pretty good price, coz average is $38.26.
Link: Banggood product page
Price: $37.94
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): Parts8, BGRCParts8, BG1efeb0, 8Couponsde, MVC8SPRING, 8BGwbg2204, 8wEbgaInS5, BG8RCToy, hoNEYbGdeAlS, BGJUNEGSG9, BGRCT10, BG8ReviTrage, Cuponation9, BGToys8, BG8OFFCOUPON, BGMatt2022, BG8FORMULAMX
(probably won’t work, but you can try them out)
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for FMS 50mm 11 Blades Ducted Fan EDF RC Motor. The lowest price was: $32.99.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).