Go down and check coupons out. Remember to check price history if it is available. You probably want to know what is the best price?
ROM 128GB, Octa Core, Resolution 1080*2340 FHD+, CPU Qualcomm Snapdragon 855, RAM 8GB, Type AMOLED, GPU Adreno 640, up 2.84GHz, OS Redmagic OS 2.0(Based on Android9.0), 5000mAh(Built in Polymer Battery), Display Size 6.65 Inch 19.5: 9 Oversized full HD Screen
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($557.99): od7off
2. ($563.99): affiliate6
coupon code has to be applied in shop’s cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGRM38, aff7off, bgssaff9, BGKtechredmagicbr
(there’s a little possibility that old coupon will work)
Price history and price alert
Check out price history chart (for all/most countries) for ZTE Nubia Red Magic 3 8/128GB.
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)).