Aliexpress
Click here… to search for UMIDIGI A5 PRO 4/32GB Black 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’m afraid that there’s no working coupon in Banggood.
Link: Banggood product page
Price: -3 USD
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Old coupons (from the oldest to the newest): BGUA5PRO, affiliate6, 7bcdf9, BGUMIA5P
(these coupons are old, so probably won’t work)
Price history and price alert
Price history (for all/most countries) for UMIDIGI A5 PRO 4/32GB Black is here.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).