If you want blades, Jantz is a good choice. They water jet then grind the blades in house. Last I knew they send them out for heat treat to a very reputable place.
Belts and supplies I would recommend Pops Supply in Georgia.Recently Pop sold the business to 4 knife makers who are doing an outstanding job. Shipping is actual cost not some jacked up price.
Handle material Terry Dunn in Texas has a very nice supply. Glen Roach out of Claremore , Okla. has some nice stuff