Scotty you can save some money if you buy 4x2 and wait??? The following is a piece I copied off the internet under the heading of expansion in hardwood timber from moisture.28%??!!! I'm so glad that timber and that environment have never been around me. When you think about it, a 4x3 ends up as a 5x4
"In wood this averages about 28% but will vary by a few points depending on wood species, specific tree and even individual boards. As wood dries below this moisture content it shrinks until the moisture content reaches equilibrium with its surrounding environment. lumber is 12% to 15%."
You will not get this if the timber is F8 (rough sawn from the mill) it will more than likely shrink.