Good cheap vegetarian protein source?

[GeneL]

PeterB Wrote:
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> Seacrest, Soylent Green isn't vegetarian ;-)
>
> GeneL, I don't know about this Mercola fellow. A
> lot of what he says seems to really go against the
> grain of the bulk of known scientific
> information...

That's why I asked… much of the information went over my head :S