The Mechtician
Gargamel Jr.
I found this; IHI RHB31 turbocharger on eBay. That was before I checked out the link to lemegacool's turbo shopping cart though
A Smart car turbo would probably be cheaper and easier to obtain from your friendly neighborhood auto wrecker, plus you can grab all the oil & coolant lines and fittings that the eBay turbo doesn't come with 
I've also done the smog pump supercharger thing with a 3.5hp Honda pump motor I fished out of the dump many many years ago. It worked great at first! I built it as a draw through setup and the gasoline ruined the phenolic vanes in the smog pump. I've since heard of dudes using AC compressors as superchargers, since they have more robust seals and are easier to fabricate flanges and adapters for. The electromagnetic clutch should be removed and swapped for a regular pulley. Good luck!
A Smart car turbo would probably be cheaper and easier to obtain from your friendly neighborhood auto wrecker, plus you can grab all the oil & coolant lines and fittings that the eBay turbo doesn't come with I've also done the smog pump supercharger thing with a 3.5hp Honda pump motor I fished out of the dump many many years ago. It worked great at first! I built it as a draw through setup and the gasoline ruined the phenolic vanes in the smog pump. I've since heard of dudes using AC compressors as superchargers, since they have more robust seals and are easier to fabricate flanges and adapters for. The electromagnetic clutch should be removed and swapped for a regular pulley. Good luck!