Ah, Demento... I own a bunch of transcription LPs that someone threw into the dumpster at a mini-storage place. They were sent from the syndicator to radio stations, who broadcast from 'em, then sent them back (or possibly to the next radio station on a list). The manager nabbed them and was going to throw them out again but asked online (this was in the early BBS days) if anyone wanted them.
=(@.@)=
Um, YES please?
Complete with corrugated mailing cartons, cue sheets (most of them), and some kind postal return card. Also got some concerts that way. All of them have national adverts embedded, just as when broadcast. The Demento LPs have locked grooves not just at the end but after each segment -- that is, the needle doesn't move by itself from the first segment to the second, you have to cue up, lift, and move to the lead-in groove for the next segment.
Doctor Demento is Squishyware. *nodnod*