So, I have brackets for shelves, and I want to get wood stock (oak, poplar,
pine, whatever it is as long as I can stain it to match the wood in the
room) for the shelves.

I have been having a problem finding wood that is truly 1" thick. As you
know, 1 x 12's are actually 3/4" thick. Does anyone know of a supplier that
I might be able to get 1x12s that are actually 1" thick?

Or, if not, anyone have any other ideas?

Thanks,

Ryan