Upgrade Garage Band for free if you have Mavericks
This quick guide assuems you have a valid license for OS X Lion and iLife.
Install OS X Lion into a VM using the fusion wizard.
Install iLife and upgrade it to the latest version using the software wizard. If this fails, just upgrade iPhoto
You can then go to the app and press the update tabs. You will be able to upgrade the applications to the newer vrsion for free.