[Green Machine]

Southern yellow pine is what I thought was in there, I have seen several vendors that carry this, lot cheaper than oak, and cheaper than ash also.
Southern yellow pine is a harder pine than "generic" pine you can get at the lumber store. I would do some searching, and call some of the vendor.s If you are not real picky, sometimes they may have a set that has a few defects that you can get for a good discount.