most of the parts i've bought from local shops and only a strut tower bar online, for my car. for my best friend's 300zx, here is what i've ordered (and he paid me back right after).
boostdynamics.com: rear strut tower bar for the 240SX and a turbo timer for the Z. i got a decent deal becuse i personally know the owner, but i've been told the business has recently shut down. <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/sad.gif" border="0" valign="absmiddle" alt='
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titanmotorsports.com: A+ AVC-R boost controller for $399.99 shipped. i don't evem think apex allows them to be sold this low. something about a contract. that's what i was told, but, that's how much it was purchased for, and i got fast shipping.
mvpmotorsports.com: F twin side mount intercoolers and an ACT 6 puck clutch. the prices were the best we could find. the intercoolers came as scheduled, but i never got a clutch. i kept emailing them and they told me it was on back order and it would be shipped from the Factory. well it didn't get shipped and they kept ignoring my emails. when i posted my experience on twinturbo.net and someone suggested i post it on the supra message board (mvpmotorsports sells mostly supra stuff), three weeks later after the initial order, the clutch came without any email saying it will be there. it just...came.
ultimatez.com: A+ fairlady Z taillights $400 shipped. this guy has very good deals for 300zx parts if you go to the links section of twinturbo.net.
courtesyparts.com: B+ i ordered clear front turn signals, spark plugs fuel filter and cap/rotor. i didn't have time to go to the dealer. they didn't give me the 240SX owner discount like they said they would.
pdm racing: C i didn't actually order from don because he only answered the questions he wanted to answer. i had the money order sitting in the mail box ready to go, for a stage 2 camshaft for my SOHC. very disrespectful for him to do that, but i still give it a C i guess. i would give it another try down the road, but at the time, i didn't think he deserved my money.