I have just checked coupons. The lowest price I could get is 13.51 USD for Flipsky Dual Way 5AX2 (in Banggood). Price history, coupons and price alert are available on this page. What is the best price?
Latest price update (UTC time):
Banggood (13.51 USD)
Banggood warehouse is located in China. Is it cheap? From what I can see this price is higher than average price (12.75 USD). One coupon is available. Cool!
Link: Banggood product page
Price without coupon: 20.78 USD
Coupon (13.51 USD): BGd777a3
(CouponsFromChina.com tip: you should apply the coupon 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): BG589b2e
(there’s a little possibility that old coupon will work)
Aliexpress
Click here… to search for Flipsky Dual Way 5AX2 Brushed ESC Speed Controller 2-3S on Aliexpress
Here are coupons that you can use.
Price history and price alert
Price history (for all/most countries) for Flipsky Dual Way 5AX2 Brushed ESC Speed Controller 2-3S is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).