Twig Archery. They carry chundoo, poplar, and Ramin shafts.
Allegheny Mtn Arrows. They got a pretty good selection.
Rudderbows has a selection of Poplar.
Hilbrands has a good selection.
Lost Nation Archery.
Kustom KIng
Cut yer own!
I tried the poplar shafts. they're great. I don't have any experience with cedar. I know it was the top of the heap for a long time, but I hear too many remarks about the quality of these shafts any more that would make me shy away.
My grandsons are rough on arrows. the poplar survive my two with flying colors, and I like the way they fly out of my bow. I LOVE BAMBOO...money arrow. Downside is they are a little more work, but it is a labor of love.
Consider the poplar shafts. Certainly less money, I'd think. They stain nicely, so far, hold paint pretty well.
That's just commercial stuff.
There is a WEALTH of info on here, the Wall, and a few other sites. Spend a coupla minutes, look around, and you find a lot of useful info to do about anything to an arrow.
Gotta love it. Have fun with whatever you try.