There are not now, nor will there be (at last word from Taldren) plug-ins for gmax. I made a tutorial on exporting models to SFC, but it really is a long drawn out process, and you'd pretty much have to have some texture it for you, as you can't get them out of gmax. Your best bet if money is an issue is to download Milkshape ($20US) and the Assimsoft .mod exporter, which I believe is free. I don't have the D/L link for it, but if you do a search for Milkshape, you should find it quickly.
Hope this helps some.