There's another somewhat recent thread here on the general side of SCS where somebody posted a bunch of the SU minis and a few of the full catalogs (sorry, don't have a link - you'll need to do a search for it unless somebody else posts a link). But SU only recently started putting the catalogs out on pdf, so unless someone took the older ones, scanned them and converted them to pdfs, they're not out and about to the general public.
Okay, found it:
Stampin' Up! PDF Catalogs by stampinmomma04 at Splitcoaststampers