I was looking at the Asus T100, and it seems to be the only competition in town. $350 for Intel Atom processor, 2GB RAM, and 32GB SSD. Micro SD card support, micro USB, micro HDMI, bluetooth, and it's running full Windows 8 instead of the piss poor Windows RT.
It's cheaper than an iPad or high quality Android tablet, and it runs the entire operating system. Where iOS/Android are more media consumption operating systems not meant for productivity. --- http://i.imgur.com/Mqy7G.gif