I have a working slot-load (with firewire) iMac 450Mhz/CD/20GB/128MB here for sale.
You have your choice of Ruby, Graphite, or Blueberry shell colors (I have spares, but this mobo was from out of the ruby). I will set it all up and ship it in the actual imac box (or local pick-ups are great).
I do not have the keyboard and mouse that came with these units, but I will include a white pro keyboard and a kensington optical mouse.
I am asking $250 OBO (please only reasonable offers, I put a lot of work into this machine).