There's a thread like this in the Vintage section, but I'm going to make one for other older toys here.
I bought this one on ebay, and it finally arrived today...
Authentic G1 Soundwave
I almost swear it's fresh out of the box, since the joints are really, really tight. Alas, it didn't include any Cassetticons, but there's some reasonably-priced bootlegs of Ravage and Rumble/Frenzy making the rounds on ebay that I might pick up.