Aliexpress
Click here… to search for Diatone ROMA L3 3 Inch 4S Power Kit Drone on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. You can get coupon down below.
Link: Banggood product page
Coupon (155.66 USD): BG28RC
(CouponsFromChina.com tip: this code has to be applied 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): BGAFF10OFF, BGCuponation10, 7bcdf9, BGMATT7, BGDAVIS
(these coupons are old, so probably won’t work)
Price history and price alert
Price history (for all/most countries) for Diatone ROMA L3 3 Inch 4S Power Kit Drone is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).