I see you are in SA. I'm up in Darwin and have been buying parts from Rockauto as well.
I also purchase goods thru Nick at Kolak@aol.com
. The vendors on JeepGarage have great prices and you'll be surprised as what is to offer in the for sale section as well.
Sad fact for us is that we'll never have the population to support cheaper pricing here in Australia.
If you are purchasing goods with a value over $1000.00 either ask the supplier to under value the goods or have them send the goods in two seperate consignments on differing days, that way you'll avoid having to pay duty thru Customs.