I just upgraded my macbook to SL and wanted to upgrade iMovie too. But the system requirement for the version available on App Store is 10.7.4 or later. Where can I purchase one that would work on a SL 10.6.8? Thanks.
I found that on ebay you can buy iLife '09. If you look at the iLife '09 tech specs, you can see this:
So that should work for you if you have SL. iLife '09 is also available on Amazon.