Is there anywhere to download Garage Band? Lion doesn't come with it. I have my iLife Discs from Snow Leopard, but I have an OptiBay so no disc drive. If worst comes to worst, I can install a USB Optical Drive, but 1.) Will that even work? Will it let me run a software Snow Leopard disc? And 2.) Do I have to? Or can I just download it somewhere online? Thanks.