Since you are near Dallas, You might try Curly Woods in Mckinney.
Last month I saw he had some Spanish Cedar S2S (surfaced 2 sides which
is S2S)-- The store is located just South of 380 on Tennesee st. He
is listed on the web. Do a Google on Curly woods. Also, he has a
jointer so I imagine he would joint one edge for you for a nominal
price. Another method would be to tack a straight board to one side &
cut the other on the TS.
PH