I've never heard of such a thing.
From http://en.wikibooks.org/wiki/SPM/Which_version_of_MATLAB :
"Scilab and Octave are free clones of MATLAB, but SPM does not currently run on either. Porting SPM to these environments should be feasible but would require an important investment."
It would be extremely useful (save money), but alas doesn't seem to be true.
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