Last time I was at Jack's Tobacco and M.C.S. they had a number of the sungrowns, including the Belicoso but I don't believe the 858 was among them. That however was a while ago.
Uhle's might have some, I remember seeing sungrowns there with some frequecy but never an 858.
I think I read in the paper somewhere that Famous had a shop in Milwaukee. I haven't been there yet.
FWIW, that's what I know.