$23.09 – Weight 9.8g, Configu-ration: 9N12P, Maximum current (180S) 13.38A, Stator diameter: 14mm, KV: 3850, No. of cells: 2 ~ 4S, Stator length: 4mm, Max power (Power (W) 180S): 214, Motor size (width * height) Φ18.3 * 14.5mm, Shaft diameter 1.5mm, Idle current (10) @ 8V (A) ≤0.51, Internal resistance 0.213mΩ.
What is the best price for GEPRC GR1404 2-4S RC Motor? I think it is $23.09 (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 code price check (UTC time):
Banggood ($23.09)
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database. Low/high price? From what I can see this price is higher than average price ($13.49).
Link: Banggood product page
Price: $23.09
Additional Banggood coupons: first page and second page
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(sometimes old coupons work, so you can check them out (this site checks them on every price update))
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 GEPRC GR1404 2-4S RC Motor. The lowest price was: $12.59.
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)).