When I was updating this page, then coupon price was 10.99 USD for JIABAILE 939A Pocket Robot (in Banggood). Just check coupons out (with price alert and history). Best price?
Latest price update (UTC time):
Banggood (10.99 USD)
Banggood warehouse is located in China. So I have checked for active coupons (all category coupons and old ones), but there was no working coupon in Banggood. What about the price? It’s a good price, isn’t it? The average is 11.68 USD.
Link: Banggood product page
Price: 10.99 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BGToys8, BG589b2e, BG25d4e7
(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
Here is price history (for all/most countries) for JIABAILE 939A Pocket Robot.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).