Just remember, shipping on an oak 4x4 of length won't be cheap. I'd find a local mill. I quit buying hardwood from big box stores because of the price as well as the fact anything over 1x8 is likely to be glued up. Here in North Central Ohio, I buy red oak for usually around $2 or so a board foot. That is a third or less of the big box store prices!
The downside is it does make a jointer and a planer necessary! You can pay the mill to surface it for you, but that adds to the cost and usually requires a lead time for milling. With rough cut, I can walk in and buy it on the spot. Of course it takes me time to mill it then.
Just depends on the tools you have, the time you have, and the money you are willing to spend for it.
I have found that hand tools are the best choice when I want to make mistakes at a slower rate of speed.
I don't suffer from insanity. I enjoy every minute of it.