Nope. Pretty much all dive shops do not have the neccesary fill rig to fill air systems.
Sites should be pretty much the only place you can fill your system, unless you have your own dive tank and fill rig.
Most responsible paintball shops will also refuse to fill an air system, unless they know you and what you intend to do with it. This is to stop pikeys from misusing paintball kit in the public and giving us all bad press!