I was looking up some information about the specific weight of an exotic hardwood and came by Advantage Trim & Lumber.
I thought it was interesting for several reasons. First, they have a great selection of wood, and can ship ($100 min.), plus they provide information about the species. They carry FSC wood for LEED credits. They also carry several different types of planking. And what is nifty - is that they have a planking calculator that converts square footage to linear feet for either 5" or 3 1/2" planks.