jack slipped

["C. Krafft" <ckrafft@olg.com>]

Had the misfortune of having my trusty Audi jack fold under the car while I
was trying to raise the car.  (wheel was off)  Lead screw looks like a
u-bolt now.  Fortunately, no one was under the car.  Was on level, smooth
surface (garage floor).  Not quite sure why it slipped, although I've
always been a bit suspicious of that jack.
Anyway, anyone have any suggestions on where to find a new jack. 
Carlsen's, Audi junk yards, etc.
Thanks,
Charlie Krafft