Source for Sansa firmware

[rhughes]

I've been running Rockbox on my e250 + 6GB SDHC and it works beautifully!  I would like to keep the original Sansa firmware up to date, though.   If I understand the process I can do that using sansapatcher with the 'of' switch to update to original firmware.  
Now the problem.  The Sandisk site only has the SandiskUpdaterInstaller and that, if I understand correctly, will hose my Rockbox configuration.

Where can I find the individual firmware update files?  My e250 currently has version 01.02.18A installed and I believe version 01.02.20P is available for it.

Thanks!

[MarcGuay]

A quick internet search would probably turn something up, and there are instructions in the Sansa FAQ on how to update the OF.  And don't forget you'll need to reinstall the Rockbox bootloader after the update.