Wouldn't ya know, I woke up this morning and remembered the name of the web site. It's moments-notice.com.
So here is my note from before with the correct name:
Somewhere -- and goodness knows I've looked -- someone mentioned moments-notice.com for booking cruises.
*Great* prices -- $800 or so including port for balcony rooms on RCI for Mexican Riviera, which price out nearly twice as much on travelocity.
Of course, there is a $25 registration fee ... anyone have input about the site or success stories???