On Fri, 24 Aug 2007 19:55:27 GMT, GrayFox wrote:

I need some wood that is about 18/4 thick, different varieties like oak,
walnut, cherry, etc. What is my best bet for obtaining such?

Probably directly from the mill, if you can find it at all. Expect to
pay a premium for dry wood, it would take a lot of time, even to kiln
dry.

Probably the best and easiest way is to glue up several boards into a
thicker one.