The BLU Win HD Windows Phone is listed for just £49.99 on Amazon UK. This is a temporary deal that lasts only for today, so you'll need to act fast if you wish to save on a new smartphone. The 5-inch handset is powered by Windows Phone 8.1, but can be upgraded to Windows 10.
For the £49.99 price tag, you will get a smartphone powered by the quad-core Snapdragon 410 processor, featuring an IPS display, 8MP main shooter, 1GB of RAM, 8GB of internal storage (with support for expansion up to 64GB), and 4G LTE. Black, white, orange and yellow variants are all up for sale.
Thanks, Arkanoid M., for the heads up!