How to get GarageBand for OSX 10.8.4

So, I like to produce music sometimes, I have dual boot systems on my mac, OSX 10.7.5 i think which has garageband, and OSX 10.8.4 which does not. But ever since OSX 10.9 maverics came out, GarageBand can't be downloaded to 10.8.X. I already know what the majority of you are thinking, my mac does not have a CD drive, it being an older Macbook air. So, I want to find a way, ANYWAY to please just get GarageBand for my current version of OS X. Thanks for the help guys.