Mile High Comics. Ah yes, one of the nicest things about living in Denver. Their prices are a bit high sometimes, but they have EVERYTHING. They even have a big warehouse aside from their main store that's also open to the public.
I heard an interview on the radio with the founder/owner of the store... he got his start by cleaning out some people's house, they had 250,000 comics they didn't want (this was back in the sixties).. he just took those instead of payment. I wish I was that lucky.