download Switch by searching for it on google...then you can change the formats of your songs to anything you like and you can change how big the file gets converted to!!!
you can make them pretty small and then you can fit about 2,000 songs on a 2 GB!
hope this helps!
don't worry Switch does not give you spyware
.. I checked! :]
this will "clean up" the files you want to put on your sansa...
it really works!! AND ITS FREEEEEE