Mac OS X for Mac Pro 1,1

[Royston Neale]

G'day,

Where could I find a copy of Mac OS X Tiger that would run on my Mac Pro 1,1.

I contacted Apple and they can't help. eBay has some but the prices are ridiculous for such old software. Downloads from web searches seem a bit iffy.

Is there a clean source out there that I could tap in to?

Cheers.