It really depends where you go. My dad has bought his PSB 5.1 system one piece at a time, and every time he buys something the discount get bigger. When my friend bought a PSB sub from him, he got a great discount because I accompanied him even though I have never personally bought anything from him. I have just kept bringing him business. He says he'll give me a killer deal on some NAD equipment when the time comes...

Just keep trying and asking.