Whole Foods is supposed to carry this one. Mine didn't have it, but it's a smaller WF so you might have more luck.
Buy (seed)* grape seed enriched conditioning hair shampoo bar, simply unscented & More | drugstore.com
I usually use Chagrin Valley, but I wanted to try a bar without castor oil, and I like the fact that it's unscented. By sheer coincidence, I used it for the first time this morning, so I'm excited to see the results. (I'm in a plop as we speak!)