Go down and check coupons out. Remember to check price history if it is available. What is best price?
GPU Adreno 640 (700 MHz), RAM 8GB LPDDR4X, Type Fluid AMOLED capacitive touchscreen, Display Size 6.67 inch, Corning Gorilla Glass 6, DCI-P3 100%, 19.5: 9 ratio (~516 ppi density), ROM 256GB UFS 3.0 2-LANE, HDR10+, 16M colors, Octa Core (1×2.96GHz Kryo 485 & 3×2.42GHz Kryo 485 & 4×1.78GHz Kryo 485), 103.6 cm2 (~86.5% screen-to-body ratio), 90Hz, Resolution 1440x 3120 pixels, OS Android 10.0; OxygenOS 10, CPU Snapdragon 855 Plus (7 nm)
Aliexpress
There’re some similar (or not) items on Aliexpress
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. ($629.99): bgshOOp10
2. ($692.99): Email5
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): BGOP7TP256, od7off, BGOP7TPROPL, BGOP7TP, BGWKOP7TP, BGD11OP7TP, BGD11AOP7TP, BG11OP7TP256, BGBFAFF2019, BG3COP7TP, BGAOP7TP, BG7TPROPL, BGNAOP7TP, BGCITYADS2019, BGBF7TP8256, BG12OP7TP, BGUOP7TP, BGD12OP7TP, BG1OP7TP, BG1DOP7TP, BG2OP7TP, BG6187TP, BGOP7TPJ1, BG7TPJ12, BGOP7TSP
(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 OnePlus 7T Pro 8/256GB Blue.
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)).