I just paid about $20 shipped for mine. You can often find them MIB via Argentina for about $30 plus shipping.
Oh, and I believe he's just an AM radio. No FM. So you'll be fine in case of emergencies or if you want to listen to Late Night Paranoid Whacko radio. But you're boned if you want to listen to anything other than orchestral musick or Lawrence Welk.
There's two types of those particular models, one is AM (yours, as BT says) and one is FM. The FM one has an ariel that folds across behind his shoulders when stored if I remember rightly. How do I know? I have both here someplace!
Rumble.
R.I.P, Menasor.
I can't believe I thought Cassettes were the way of the future.
Don't blame you for keeping him, I think they are great. There is a different AM radio out there which kind of looks like a cross between Megatron and Soundwave who comes in similar colours to your Radiobot or a red/grey scheme.
Rumble.
R.I.P, Menasor.
I can't believe I thought Cassettes were the way of the future.