2.8 12V V6 Cat

["Bryan, Curtis" <bryanc@wdni.com>]

The innards of the driver's side catalytic converter became loose in our
'93 90 csq (2.8 12V V6) with only 63,000 miles.  I pulled the unit off
to see if I could shake it out, but nothing came out.  It appears a
rather large chunk is loose.  I have called everywhere for a
replacement.  Audi wants $1000 for each converter and of course
recommends replacing both at the same time.  Anybody have any luck with
aftermarket brands?  Any other solutions?  TIA

Curtis Bryan
'93 90 CSQ