RAM: 6GB, SIM card: supports dual nano SIM cards, Camera: 48MP SONY IMX586 + 13MP ultra wide, External memory: 2TB (not included), Screen type: FHD + IPS, CPU: Qualcomm Snapdragon 855, Battery: 5000mAh, Bluetooth version: 5.0, ROM: 128GB, Screen size: 6.4 inch, Camera type: flip camera with dual lens.
Just check coupons out (with price alert and history). Let’s see what best price is ATM.
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in Hong Kong.
Link: Banggood product page
1. ($521.99): BGCITYADS2019
2. ($539.39): od7off
3. ($570.99): 7bcdf9
just apply this code in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGASZF128, aBGASZF6128, BGASZF6128, affiliate6, BGZF6128, aff7off, BGaDmITAd, BGBFAFF2019
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Do you need price history chart (for all/most countries) for ASUS Zenfone 6 6/128GB Global? There we go. The lowest price was: $521.99.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).