Good Source for Used Parts

I broke the cruise control switch lever on my 2004 Prius. After a few epoxy repairs, it went completely. Toyota wants $105 for a new one, and I found a dealer in Arizona who would ship me one for that price and pay freight. But someone else turned me on to a place called "Black Diamond Auto" in Washington State. They sent me a used one that works perfectly for $20 plus $15 shipping and handling. You can Google them or use < [email protected] >. Why put a brand-new part in an old car that has thousands of parts with 280K miles on them already?