When I was updating this page, then coupon price was 299.99 USD for MJX Bugs B18 PRO (in Banggood). Basically copy coupon, view price history or create e-mail price alert. Let’s see what best price is ATM.
Latest coupon code price check (UTC time):
Banggood (299.99 USD)
Banggood warehouse is located in China. Coupons for MJX Bugs B18 PRO Drone with 2 Batteries? Nope, there’re no coupons in Banggood. Well, is it a good price anyway? Hmmm, price is higher than average (which is 255.62 USD right now), so better set price alert down below…
Link: Banggood product page
Price: 299.99 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BGa11279, BGa639e8, BG8OFFCOUPON, TTBLACK5, BGToys8, BGAUGUST8
(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 MJX Bugs B18 PRO Drone with 2 Batteries.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).