For a holster check out Crossbreed or Comp-Tac, imo the two best holders for carrying a full sized pistol concealed. That being said, you can't carry at the Post Office, or any other Federal building, but I'm not sure what other places you might not be able to. Like the laws on carrying in places that serve alcohol vary form state to state. I'm not a lawyer, and this isn't legal advice, so make sure you check the laws for yourself.