How to get OSX Yosemite outside the Mac App Store
It's on usenet already &amp; no doubt torrents [though I don't go there]
The Release build is 14A389


  the release version of Yosemite is build 14A389—the last developer seed was build 14a388, also known as GMC3. The last public beta version was build 14A388b. That makes the MAS release newer than all other released builds


Up to you, of course, to decide whether you trust the source.

SHA1 hash for OSX 10.10 Yosemite public release? Has the SHA1 so you can check whichever version you get...

Extract...
run this command in Terminal:

shasum /Applications/Install\ OS\ X\ Yosemite.app/Contents/SharedSupport/InstallESD.dmg


response should be

eebf02a20ac27665a966957eec6f5e6fe3228a19  /Applications/Install OS X Yosemite.app/Contents/SharedSupport/InstallESD.dmg