Possibly E-bay; local music stores; the Yahoo Wurlitzer Elec Piano group; classifieds.
You could buy a fully-restored model from Speakeasyvintagemusic, I think -- I'm sure it will be breathtakingly expensive, but probably one of the very best you could find, short of being lucky.
I found a 200A on the sidewalk on trash day -- no legs, no pedal, but you never know what you'd find in your hometown.