For around $50 you can purchase the Bluetooth enabled Logitech K480 Wireless Keyboard, compatible with Mac OS X, Windows, Chrome OS, iOS, Android and perhaps even QNIX.  The slot at the top of the keyboard will fit your phone or tablet and the unit is less expensive than the docks available for Surface, ASUS and other hybrid tablets but does not add the additional features and battery life that those docks provide.  Techgage tested it out successfully and enjoyed its usability although additional dedicated keys such as Send would improve this keyboard significantly.

"A mobile keyboard that does it all, on all of your devices – that’s quite the Holy Grail nowadays. Well, what we’re looking at here is an offering from Logitech that may just suit the needs of your mobile lifestyle. Whether you’re needing to type on your iPad, smartphone, or even your desktop, this keyboard won’t hold you back."

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