Upgrade Macbook Pro 10.5.8 to 10.8
Is there any way to upgrade the OS on my computer? Since Mountain Lion it appears Apple took away all physical OS install options. I can't even find the Lion USB drive on amazon! I spent time upgrading my RAM and HD so I could better support the new OS, but now I feel like I'm stuck on Leopard... Someone please tell me I have at least one option.
MacBook Pro, Mac OS X (10.5.8)