http://www.symmetricom.com/products/...c/SA.45s-CSAC/

This is a true atomic-clock-on-a-chip. Just pulling stuff from the internet it appears to be roughly $1500 for "small quantities", but probably 2-3 grand for a single chip. That kind of price is incredibly amazing actually, this thing is a an atomic clock on a chip.

It pulls less than a watt.

What kinds of cool radio-related stuff could this be used for?