you can get them on ebay for $40 or so. I had one installed for $99 or so at muffler tech and then went to the smog place and passed with flying colors! nevermind I had a nonfunctional egr.
Just gut the sucker for now. Wait until you have a smog inspection before you get a new one. That way you have a fresh CAT for the next insp and you don't bang up the new one on rocks to. (is that enogh smilies for ya Kevin)