Aliexpress
Click here… to search for T-Motor F60 PRO III RC Motor on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. You can get coupon down below.
Link: Banggood product page
Coupon (23.77 USD): FBCOUPON1
(CouponsFromChina.com tip: just apply this code in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Old coupons (from the oldest to the newest): BGF60PRO, BG12MRP, BGGEPPart, 0e7f33
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for T-Motor F60 PRO III RC Motor.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).