Upgrade 10.5.8 to 10.6 without disc
I currently have an early 2008 MacBook Pro running 10.5.8.
For various reasons such as software needs, I need to upgrade to at least 10.6.
However, and here's the kicker, my CD drive no longer functions. Therefore, purchasing the physical software would be kind of useless at this point.
I'm also well out of the AppleCare agreement.
Do I have any options?
(And don't tell me to just buy a new computer. Not helpful.)
MacBook Pro, Mac OS X (10.5.8)