Try the primitive and traditional archery forums. They have been discussed they but seems they are not commercially abundant.
I am going to try to make some Lodgepole Pine (Chundo) and Western Larch (Tamarack) myself this summer. I will cut 3/8" square stock on my bandsaw from some seasoned 36" log cuts I have. Then I will shave them on my Veritas dowel tool that I recenty got. Then I will burnish them smooth on the burnish/compressor blocks that I just had made.
I expect the first good dozen to come out costing me no more than $10 per shaft!!! Maybe after that I can get the process down to marketable.
Both are good arrow woods, but kind of spendy and hard to find.