You can download GEOS here, but only if you agree to not sell it further: http://cbmfiles.com/geos/index.php
It appears to be a bit complex process that consists of putting together your personal installation of GEOS components. I have never tried it, but if you are dedicated about getting GEOS, it should work all right.
http://cbmfiles.com/geos/geos-13.php
On this page you can find the images already to go. Just stick in the emulator or use a utility to transfer them over to your real machine.
If you have a sd2iec device, the current beta firmware will now run geos and wheels.
Later,
dabone