found local source for corn gluten
 

For any interested in trying out corn gluten for weed, crabgrass, etc
control.. I found a local store that carries it in 50 pound bags: THS
FEEDS in north Raleigh
Phone: 919-873-0303. Their price was quite a bit less than the
Gardens Alive online store, and of course, no shipping charge. FYI
It's not perfect, but it does cut down on the weeds considerably, we
have found. And it provides a light shot of nitrogen as well, and it's
basically corn residue, processed so you can apply it with a spreader.
Basically an organic type weed and feed. DON'T put it on soil where
you are planning on planting seeds of any kind.