Mountain Lumber's heart pine does cost arm + leg, but it is the nicest flooring I ever worked with. Almost every inch is usable.
We have also made our own flooring from reclaimed boards. When we do this w always use spline joints instead of T&G, because you do not lose 1/4" of face from every milled tongue. At these prices, every 1/4" counts!
Splined joint, BTW, means a groove is milled into every edge, and a loose tongue is milled from common wood and inserted in each joint separately. It makes greatest sense when you are face-nailing.
Casey

True reclaimed wood does cost an arm and a leg. There's only so much in existance, and the market allows it to command a premium price.

Goodwin's heartpine is really outstanding and I especially loved the staff, they become like family, really. They went out of their way to find exactly the wood we were looking for to match our remodeling. We knew it wouldn't be cheap, but it was affordable.