Aliexpress
Click here… to search for OnePlus 8T 12/256GB Global on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in Hong Kong. I have no active coupons for you right now.
Link: Banggood product page
Price: -3 USD
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Old coupons (from the oldest to the newest): BGOP8T256, Email5, BGDO8T256, BGWP8T256, BGBGSN8T256, BGBFFS8T256, BG20OP8T256, BGOP8T256S, BGOP8T256SIL, BGILOP8T256S, BGHKOP8T12, BGILHKOP8T12, 7d18f7, BGOP8T01, BGCuponation10, BGSS8T12, BG3SSYB8T12, BG8T12325, BGOP48T256, BG428T12, BG47OP8T12, BG47OP8TGE, BG4128T12, BGOP8T12D, 13f142, BG0d6f87, BG994202, BGOP8T25625, BGff48e6, BGa52aba
(probably won’t work, but you can try them out)
Price history and price alert
Do you need price history chart (for all/most countries) for OnePlus 8T 12/256GB Global? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).