Aliexpress
Click here… to search for UMIDIGI A3 Pro 3/16GB Gray on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in Hong Kong. I am tired of searching coupons, but I found one for you…
Link: Banggood product page
Coupon (82.99 USD): Email5
(CouponsFromChina.com tip: put item in your cart and apply coupon code there 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): BGA3PRO16, affiliate6, bgssaff9
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Here is price history (for all/most countries) for UMIDIGI A3 Pro 3/16GB Gray.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).