I'm in San Jose, and I have one I might sell or trade for. I'll break down the original price for you:
$200 for the tranny
$60 for busted 280z transmission( bought just for bell housing)
$175 for Troy Armish in Fremont, CA( now in Tracy) to machine bell housing and put it back together. That's $435 not including the additional cost of driving around finding all of the parts, and dropping off and picking up the finished transmission.
And if you have a 280z, you know you will need to shorten that driveshaft by 1.75" - 2". If you know someone in SoCal TonyD knows of a place that does it for $50. I called around the SF bay area, and had mine done for the cheapest qoute of $135.
Let me know if you're interested, and if you've got parts to trade for, or want to buy it out right.