Hi, Jen. It's likely that your Sandbox has to be large because of Garage Band's instrument samples and standard loops. The User's Guide has a section that explains how to create your own Sandbox script, sharing additional items. You can use those general steps, and share /Library/Application Support/Garage Band (which will save almost 3GB), as well as /Library/Application Support/iDVD (which will save 2GB).
Hopefully that'll help get you back on track.
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--Dave Nanian
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