It was quite a bit of work to make the flooring. Over about three weeks, visiting about 6 different Lowes and Home Depots, picking through the 2x10x8, 2x12x8, and 2x10x16 stacks, I selected only boards that were perfectly clear. I needed about 70 eight foot equivalent lengths. I got really good at sorting through and restacking the bunks of wood.
After that, all were cut down the middle, jointed one face, and planed to 7/8" thick (turning 5/8" into chips). Sometimes they needed re-jointing as they warped after planing, during the process. Then joint one edge, cut to final width, and finally tongue and groove every one. I made sure for the last planing pass, that every board went through without touching the planer setting so that the thickness were all the same. Oh, and then I cut off about 16" of each board, since we only needed 78" lengths.
All that because no-one makes 7/8" thick T&G yellow pine. It is all a 32nd under 3/4".
We did get a quote from a custom milling shop for this and it was around $5k. I think it was about $1200 for my raw material. So the quote was probably very reasonable, considering the effort it takes.