I'll start it off with 3 companies that I have dealt with and have personally used products from whose products are priced fairly for what you get.
1. Tyler Acoustics - This is a high end speaker company with "mid-end" pricing mainly because there is no middleman. Tyler Lashbrook, the owner, sells only though the internet and has no dealer network. He uses quality Seas and ScanSpeak drivers. I have two sets of his speakers. He also usually answers his own phone if you call there to him in Owensboro, KY.
2. Signal Cable - Run by Frank Dais, a real nice guy, who offers high quality speaker and interconnect cables. I have about 4 sets of Frank's speaker cables, interconnect cables and power cords in various systems in my home. Well made cables and relatively inexpensive ...
3. Blue Jeans Cables - Also quality cables at reasonable prices. You can also buy Belden and Canare speaker wire by the foot here and add your own connectors if you want. I use their Canare 4S11 speaker wire which has four separate internal wires. You can bi-wire very easily with this cable.