My dad orignally had a dual 450 MHz processor in his Sawtooth, then upgraded to single 1.5 GHz from FastMac through We Fix Macs. Considering that We Fix Macs handles a lot of stuff like this, they might sell ripped-out boards and processors still in good condition. Try http://www.allmac.com. The only other feasable option would be to go directly to Apple, and they'll charge you a fortune.
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Cheers! :-)
- JediJoker

Current:
- "ProBook:" 15.4" MacBook Pro Core 2 Duo 2.33 GHz
- Mac Classic II
- Old PowerBook

Moved On:
- "The Book of Power:" 12.1" PowerBook G4 Aluminum 1.33 GHz
- Purple iMac