It is actually very rare to find any stainless steel that will hold an edge nearly as long as carbon steels will. You will find that any stainless steel blade that is the same quality as a carbon blade will be significantly more expensive that 95% of the stainless you buy on the markey today. Stainless can be made almost as good as the top line carbon blades. It is very rare to find any that are made this way. None of them are going to be found in yoru average store. Some specialty knife shops carry them regularly.
As for the broadheads, I would go with Carbon Steel. Tougher, stays sharp longer, not likely to chip on hard bone and not as likely to bend as stainless. Downside, slightly more maintenance of the head. Gotta keep them oiled or covered with wax.