So far I've kept (and bought) old SU catalogs. I'm also an EBay buyer so I have used them. I'll probably keep at least one copy of each catalog forever. Magazines I haven't gotten rid of yet, but once I get to sorting them I am sure some will go.
"If a person who indulges in gluttony is a glutton, and a person who commits a felony is a felon, then God is an iron.”
― Spider Robinson