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
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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
just apply this code 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/feV
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
(there’s a little possibility that old coupon will work)
Price history and price alert
Here is price history (for all/most countries) for OnePlus 6T 8/128GB Midnight Black. 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)).