Its been a while since i tried to order parts from st charles isuzu and came to find out they dont sell isuzu parts anymore. Does anyone have a place to get oem parts cheap?

I found isuzuparts.com which aint to bad but they dont sell the platinum plugs, I really dont feel like paying my dealer $24 for each plug.

also has anyone tried the rotors on ebay? I need front rotors and was wondering if they are just as good as OEM or worse?

thanks
adam