I have bought from a number of people over the last couple of years, mostly commercial wreckers I have found via Trademe and have generally had pretty good experiences. Thought I would share some of them some other people can benefit.
I try Pick A Part in Wellington first as they have the best prices of anyone but they often only have one or two Isuzu's that are picked thru pretty quickly.
There are a number of Trademe sellers advertising cheap Isuzu parts but I have found that it really pays to shop around as prices can vary wildly, as can service.
Best guy I have dealt overall with has been Gavin from Country Automotive down south, usually has what I need and his parts are in good condition and priced well. He can be a little slow to communicate via email but always comes through.
I have also bought a bit of stuff from Isuzu Parts Specialists in Auckland, they always have stuff in stock and are quick to deal with however their prices are at the high end. My last two purchases haven't been very good ones though and I had to return my last purchase to get a refund. The description of an excellent condition drag link was far from the truth with one balljoint thread damaged and one boot torn. It was suggested that I could use a thread file to repair the thread and purchase a replacement boot as well to resolve the issues. After a bit of discussion I got a refund but had to return the product and had to wait for the money to be returned.
If anyone else has good experiences to share then post them up, also others to avoid or use as a last resort would be good as well.
Cheers
Matt.