I'm guessing this is the one:
http://m.ebay.com/itm/EASCO-721413-3-8-DRIVE-FLEX-HEAD-RATCHET-WITH-QUICK-RELEASE-BUTTON-THUMBWHEEL-/222223645328?nav=SEARCH
http://www.tooltopia.com/precision-instruments-c3fr250f.aspx
^I'm planning on buying one of these soon. Have read only good reviews on it.
Also: http://www.garagejournal.com/forum/showthread.php?t=278551