I have just checked coupons. The lowest price I could get is 13.51 USD for Flipsky Dual Way 5AX2 Brushed ESC Speed Controller 2-3S (in Banggood). Check coupons or create price alert down below. What is the best price?
Latest price update (UTC time):
Banggood (13.51 USD)
Banggood warehouse is located in China. Well, is it a good price anyway? Maybe there’re no more promotions for this item, because current price is higher than average (which is equal 12.75 USD) We have found one coupon for this product!
Link: Banggood product page
Price without coupon: 20.78 USD
Coupon (13.51 USD): BGd777a3
(CouponsFromChina.com tip: put item in your cart and apply coupon code there 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): BG589b2e
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Aliexpress
Here are coupons that you can use.
Price history and price alert
Check out price history chart (for all/most countries) for Flipsky Dual Way 5AX2 Brushed ESC Speed Controller 2-3S.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).