When you called at the dealership did they laugh at you?
You kids have to understand something... RB engines are great engines... yeah! But they are not readily available nor are their parts! If you need parts... you need alotta $$$ when it comes to these engines. They are very impractical this day and age for the every-day Joe plain and simple! It's funny when I see threads like: "Yo-yo-yo i wanna drop an RB26 in my dorifto S13" and the kid is working at McDonalds...
But to answer your question:
You can get parts through
www.motorex.net and
www.rbmotoring.com
But to be plain and simple: You ain't gonna find the parts cheap...