Although it was discontinued at first (I think), you can now buy a DVD of 10.6 (Snow Leopard) on Apple's online store: http://store.apple.com/us/product/MC573Z/

Although it was discontinued at first (I think), you can now buy a DVD of 10.6 (Snow Leopard) on Apple's online store: http://store.apple.com/us/product/MC573Z/A/mac-os-x-106-snow-leopard http://store.apple.com/us/product/MC573Z/A/mac-os-x-106-snow... You can also buy Lion and Mountain Lion, too, as a code to use on the Mac App Store. (Presumably Mavericks will join them soon.) More info: http://store.apple.com/us/help/downloadable_software#MacOSX http://store.apple.com/us/help/downloadable_software#MacOSX