Aliexpress
Click here… to search for FrSky VANTAC ROVER3 FPV Tricopter ARF on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in Hong Kong. One coupon is available. Cool!
Link: Banggood product page
Coupon (194.39 USD): bGhOnEy10
(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): BGOCT15, 502C6B, BGOTC20, BG10FrSky, BGBFAFF2019, BGFRVUS, BGVANTAC
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for FrSky VANTAC ROVER3 FPV Tricopter ARF.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).