Aliexpress
Click here… to search for Diatone 2019 GT R349 HD MK2 TBS Drone PNP on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (206.10 USD): BGAFF10OFF
Coupon (206.10 USD): bGhOnEy10
Coupon (206.10 USD): BGdragonBoat
(CouponsFromChina.com tip: just apply this code 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): BGGTR349MK2, TTxBG10, Wholesale20, AFfbG10, BGWKr349hd, 502C6B, BGANIKDR349, BGBFCR25, BGCITYADS2019, BGWKHD349, BGVDay10%off, BGMPB2020, BGSS10%SW, bgshOOp10
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Price history (for all/most countries) for Diatone 2019 GT R349 HD MK2 TBS Drone PNP is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).