lo and behold
I haven't been able to find these anywhere in the Southern California area; surprisingly they are not stocked at the retail locations that carry the standard Probars. I did not want to commit to an online purchase of an entire box, and really didn't want a whole box of just one flavor.
Well, lo and behold, I was at the Grand Canyon last week and wandered into Market Plaza for a few last-minute supplies, and they had every flavor in stock. I tried the Nutty Marshmallow, and it was pretty good. It is a nice smaller version of the regular Probar for those times when you don't need something as substantial, and don't need ~380 calories. And as usual from Probar, you get a quality food product that is organic and vegan.