I'm needing a few 1/2" shank router bits that are top bearing guided bits for mortising holes for guitar pickups and audio controls. I'd like a 3/4" wide by 1/2" high cutter as well as a 3/4" wide but 1-1/4" tall cutter. Who is a good supplier of these bits? I simply refuse to buy them from a luthier supply shop as they charge 3 times the price of a standard bit. Advice and pointers welcome.