Just check coupons out (with price alert and history). You probably want to know what is the best price?
4GB RAM, 64GB ROM, Global, UK Plug, Golden, Display: 5.5 inch FHD screen, CPU: Snapdragon 625 Octa Core, System: MIUI 8 OS (Android 6.0), External Memory: 128GB, FDD-LTE B1/B3/B4/B5/B7/B8/20
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):
Price history and price alert
Price history (for all/most countries) for Xiaomi Redmi Note 4 Global Golden UK Plug [Fast-08] is here.
Price records source(s): Gearbest
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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)).