>> http://octopart.com/partsearch#!?q=powerpc&start=0&limit=10&filter%5Bfields%5D%5Bcategory_uids%5D%5B%5D=2f57e25d1efcf490&sortby=avg_price%20desc

> Even old 7447 that equipped Pegasos G4 are obscene high pricey on this site.

1.0 GHz 7447(A) starts at about 125 USD on that site. You find that obscenely high?

> Octopart is the only reseller or there are others?

Octopart is no reseller at all but a search engine for electronic parts. It lists the prices of the parts at the various resellers offering the parts.