Liveware is drivers for the SBLive! cards.
LiveDrive is the breakout box that fits in a 5 1/2" drive bay and has about a million and one I/O connections for your SBLive.
If you have an SBLive! Full original, an X-Gamer, MP3+, SBLive! Value Rev2 (with the yellow digital output jack, it's the same board as the X-Gamer and MP3+ just no software with it at all), X-Gamer 5.1, MP3+ 5.1 or DE 5.1 you can just buy a livedrive separately and use it (in short: anything but the original analog-only Live! Value)
The Value r2, X-Gamer and MP3+ are the same sound card PCB as the first platinum they just have different bundles and don't come with the live drive in the box.
Same story for the X-Gamer 5.1, MP3+ 5.1, and DE 5.1 compared to the Platinum 5.1
And AFAIK the original full live can use the Live drive to, though it's PCB is different, but it has the daughter card that has the same stuff as the LD anyways...
As to where to get it straight from creative's online store is the only place I know.