its supposedly the "newer" version of the laser that is in the slim ps2. No clue if its rare -- I never took any real steps into the PS2 scene so who knows. Seems like some places have it for around $70 or so, but tack on a few bucks for shipping and the install (and possibly shipping for the system to the installer) and its a wash.
She's just gonna get a new system and I'll swap out her case. I can't see that being a big deal, but those could be famous last words.