Well at work we normally go to www.zones.com, www.pcmall.com, and dell will have those also. Even though it's a sun-box you still might find the drive at dell.
Other companies i've worked for went to www.cdw.com for small-medium-large business shopping.
Apparently the number for the SPUD HD bracket is:
Sun charges $70 for them,ouch. I wonder if the older ones will work.