Although all of our new-ish Linux cubes have eSATAp connectors on them, I've had a hard time sourcing a cable that will allow me to connect an un-enclosed drive to the eSATAp port. I eventually found this:
http://www.cablesonline.com/39pooves5vsa.html, for $20.
I checked with monoprice live help; they don't have them but they say they'll look at getting them.