You may not want farmers but a health food store. You can buy the seeds for sprouts (mung bean, alfalfa, soy) and for wheat grass at the health food or bulk food store. I don't know about how long for wheat grass, but sprouts only take about a week to grow.
I don't know about wheatgrass but my local grocery stores sell a bunch of different kinds of sprouts in the specialty portion of the produce section. I buy clover sprouts all the time ;-)
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