Aliexpress
Click here… to search for Xiaomi ZMI Z1 Phone on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. So I have checked for active coupons (all category coupons and old ones), but there was 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!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): zmiz1, 502C6B, qazzlf, fphone, BGzmiphone, aff7off, bgssaff9, bgchinafest, BGFRTD11, BGBFAFF2019, BGCITYADS2019, Email5, BGFTTP56, bGhOnEy10, BGAFF10OFF, BGdragonBoat, BgcLuBofErtA10, BGCuponation10, 13f142, BGHONEY2110
(there’s a little possibility that old coupon will work)
Price history and price alert
Price history (for all/most countries) for Xiaomi ZMI Z1 Phone is here.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).
why this product is only available on Banggood.in not on Gearbest
well, it actually is available, but the price is crazy