OnePlus 6T 8/128GB Midnight Black (Banggood, Aliexpress: System: H2 OS (Based on Android 9.0), CPU: Qualcomm Snapdragon 845 Octa Core 2.8GHz, Beidou, Accelerator, Glonass, Display: 6.41 inch, SIM Card: Nano SIM card + Nano SIM card, Camera: 20.0MP + 16.0MP rear camera and 16.0MP front camera, Feature: GPS, Sensor: E-compass, 2340x 1080 Pixel Screen, A-GPS, Gravity Sensor, Bluetooth: 5.0, Gyroscope, Light Sensor, Fingerprint Sensor, RAM + ROM: 8GB RAM + 128GB ROM (the best price with coupon)).
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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 Hong Kong.
Link: Banggood product page
1. ($369.99): BGUSOP6T
2. ($450.99): 7bcdf9
apply it in your 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): 11BGR6P4, 11BG6T8, BG116T8, 6T11BG8, 12bgop5, 12MCOP6T8, 1BGOP6T2, Alibuy9137, 1BGOP6TA, 2BGOP6TB, 62ca20, 3BGOP6T, JPBG128W, koninimbesinop6t, f262fb, JPBG128h, plfonall, 19BGOP6T, 4OP6T, 4bgop6t, 5BGOP6T, bg845, BG5OP6T, BG6Tplus01, BGDJOP6T, BGOP6T527, BGONE11, BGaDmITAd
(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 OnePlus 6T 8/128GB Midnight Black? There we go. The lowest price was: $369.99.
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)).