Shoot ... Powder Valley had 1 and 8 lb containers of H4350 in stock last week. Leads me to think a big lot was recently sent to distributors recently, so I would think that somebody might have it in stock somewhere.
I was in three little shops in PA last week and they all had H4350, varget, H4831SC and just about every RL powder. So I think if you google gun shops on your route and stop in a few someone should have some.
These little shops all had a variety of primers and bullets (no 6.5 bullets of course) too.
If he is shooting bullets 130 gr and under, varget has been more accurate and very close on speed in several 260's and 6.5 creedmoors I have loaded for.