Dell 7275 2-in-1 tablet/laptop, refurbished from dell direct, ranges from $349 to $389 (most listings are $349). Note that this comes with the hinge style keyboard option, not the folio case style cover (with kickstand akin to surface) option. So it's one set angle, not a hinge like movement, however I do prefer that as compared to the kickstand which is harder to use on laps, YMMV (previous experience with a lenovo miix700).
12.5 FHD 1920x1080 touch screen
2 thunderbolt 3/usb-c
intel core m5-6y57 1.10GHz/2.80Ghz, 4m cache
FWIW, here's the geekbench comparison with regular core i5-5200u
Multi-core: 5017 vs 4124
Single-core: 2474 vs 2466
In my opinion this would work great for light load work task in the form of 2-in-1, and a good surface alternative, especially with its thunderbolt 3 ports (i.e. egpu capability).
Side note: Standard 100 day warranty included, $1yr extended warranty for $49