The regular, non-studded variety. I'm not able to find an established trade forum/vendor price. PM me if you have one and let me know how much you're looking for it!
TBH, these don't come up often because the sets to produce them are a pain and not really profitable. You're probably better off grabbing the BODs off vendors for cheap and completing them. Good luck in your search!
I only know of a few completed sets. I don't know of tunic available, but there was a set of legs recently. I think the dude wanted a good amount for them too.