Maybe try Manufacturer's Minerals on Monster Road.

Also those of us on the east coast get pumice from the west coast.

People raise chickens everywhere, so look for chicken grit, preferably "grower" size. Although I live in a city I can get it Farm and Fleet here. I'm sure there's a similar retailer by you. That's the granite.

And most people skip the bark ;-).

Now I am thinking about 1/4 inch pumice and Granite and thinking that's really big! What about 1/8 to 1/4?

I think 1/8-3/16inch are the best sizes. For me at least, but do I have 1/4 inch pieces? Yes. So to answer your question anything between 1/8-1/4 of an inch is good. Any bigger is too big imo:).

I was just using pumice and cactus mix. Now I use between 30%-40% pumice, 30%-40%perlite, and the rest cactus mix. I love it:). I just use the cactus mix as filler:). I hated perlite because it's so freakin light, but with the pumice I like it. Lightens the load:).

That's much like I use now.