$50 for a second hand one ???????? why would anyone spend that sort of money for such a common part. There are Kirby's being thrown out everyday and most of them will have their carby's attached. Just search on Gumtree and you'll soon find one.
Actually put a message under the wanted section on here and I'm sure someone will answer the call.

Cheers,
BB.

I live a 24 Hour lifestyle, but every now and again I seem to fall asleep, well at least that's what my wife tells me.