Cheaper Than Dirt is offering used magazines for 8 bucks. I imagine they are trade ins from some PD or another and probably carried a lot and shot a little. The stock number is MAG-644.
New girlfriend's ex husband uses a 4006 as a LEO and we were looking for a Christmas gift that wasn't too expensive. These and one of their Tiawan Tactical bags will make him a nice active shooter bag.
I have had nothing but good experiences with CTD, as long as you don't expect too much from their imported cheap scopes. If you shop carefully you occasionally find bargains like this.