I have had a good experience with Rockauto except a few years back when i was replacing my halfshaft. They sent me the ones for the J30 instead of 300zx three time. By the time it was all said and done I ended up shipping them a spare set I had laying around.
I got a discount on my order, my spare set of halfshaft rebuilt on j30 cost, and it only took a month and a half. I want to say it ended up costing around 75 after a lot of headaches. So glad I happen to have more than one Z and enuff parts to build at least two more Z cars!