Type Super AMOLED, 2.84GHz, Pixel Density 402PPI, CPU Snapdragon 855 Octa Core, OS Funtouch OS 9(Based on Android 9.0), Display Size 6.41 Inch Amoled Water-drop Screen, Resolution 2340*1080 pixels FHD+, RAM 6GB, ROM 1282GB, 4000mAh(Built in Polymer Battery), GPU Adreno 640.
You can create price alert here, copy coupons and view price history. Best price?
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 coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($359.99): BGCITYADS2019
2. ($371.99): od7off
put item in your cart and apply coupon code there 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): iQOO6, affiliate6, aff7off, bgssaff9
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for VIVO iQOO 6/128GB CN Blue. The lowest price was: $359.99.
Price records source(s): 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)).