I would go up to the pharmacy and ask for it. I don't know how much it is but it's not very much. If they're not busy I'm sure they'll have no problem with you asking.
It seems a little sketch asking for an opiate antidote will this raise any red flags? Also I know price varies from state to state but can anyone give me a rough estimate on how much it would cost?
I live in a state where it's OTC too, just never gotten it. There's no list, I don't even think they check your ID to buy it. They've encouraged friends and family of addicts to get it for safety, I don't think they're gonna profile the people who chose to buy it.