CWD, Antares, Tad Coffin, Devoucoux, Butet, Dy'on, Marcel Toulouse, Eskadron, Stubben, Wylde, Tredstep, GPA, IRH, Tailored Sportsman, Collegiate, County, Black Country, Dalmar, Premier Equine, Equi-Fit, Herm Sprenger, Hermes, Mattes, Nunn Finer, Pessoa, ThinLine, Vespucci, Tailored Sportsman, Ovation, Warendorf......just the ones off the top of my head
As far as tack magazines, I shop mostly Dover Saddlery and SmartPak Equine.
ETA: oops, just saw you wanted products only available through the manufacturer. Most of the ones I listed are. Posted via Mobile Device