Doesn't fold out as a tablet, but my dell XPS 13 is epic. I did swap out the WiFi card, but only because I run Linux, and the broadcom one had crappy driver support.
Dell is releasing a version of the XPS 13 that converts to a tablet. Although I doubt it will classify as cheap
Also only with Core M processors I think
The latest iteration seem to ship with 7th gen i7 or i5 processors, but the lowest powered and slowest Y-series versions of those processors. No idea what that means in real-world performance though.
All the Y chips are Core M chips, as used in the MacBook...
The XPS 13 made me smile again while developing. Running Ubuntu.