How ore where can I download this version?
How ore where can I download Mac OS X v10.6.0 for my Macbook?
There are no Apple-sanctioned general-access downloads available for OS X 10.6.
That version was licensed sold via what were variously known as retail OS X installation disks; via the purchase of a DVD disk.
If your hardware supports it, 10.7 is available via download from the Mac App Store, and via a USB key disk that's available.