Borders is like down the street from us, about 10-15 mins away, hehehe.
Anyways, as far as parts for cheap goes, best bet is the second hand stores which can be found anywhere in japan, UpGarage and Parts Off, to name some of them.
as far as Autobacs goes, its everywhere, its like Autozone for the US and i dont know what the australian version is. The Autobacs in Tokyo Bay is a site to see, its a Super Autobacs they have like starbucks coffee and stuff in there too.
If you are staying around Tokyo then this one is a good one to see. I heard (I haven't been there yet) that they have crap load of stuff. here is the website if you wanna check it out. http://www.hasegawa-net.com/index.html enjoy ur stay.