Modula-2 compilers

[91erm at cs.williams.edu]

Does anyone have leads on free or real cheap Modula-2 compilers with
source?  I'd prefer something which works, and optimization does not have
to be ideal.  If you've got info, I'd love to hear it.  I'm not on the
list normally, so please cc: a copy of any responses directly to me.

Thanks in Advance,

Evan R. Moore
Williams College
91erm at cc.williams.edu