We order all of our hardwood floors from Southern Wood Flooring & Supply, it's located here in Dallas. As far as I know they only sell to contractors. Any wood flooring supply company should be able to find a similar product for you.

On this project we used a 5" wide, white oak flooring, select & better grade, quartered & rift sawn, in 2'-10' planks. The 3/4" thick plank will get you the same amount of wear as a standard wood floor. This type of product is a good solution when you want to install wood flooring but don't have the ability to install the necessary plywood underlayment required for a typical hardwood floor.

Here is a link to the specific manufacturer of the flooring we used: http://www.grafbro.com/flooring-engineered.html