Ahoy there and welcome to the forum.
Parts are getting harder to source however we can still get our hands on most things with a bit of detective work.
Just about all service items i.e. oil filter, spark plugs, air filter, fuel filter, ignition leads and so on are all available from aftermarket parts stores such as Supercheap, Repco, Autobahn or if you can find an independant auto spares shop and support them as I do
Replacement parts (new) can still be had at Honda but the general rule is that the bigger the parts the more it will cost. Having said that I can tell you they do have limited stock and for some items you might have to chase people from overseas i.e. the Acura crowd here that might still have parts in stock.
Second parts is by far the best way to go where possible. The parts are cheaper and unless it is an item that is known to become faulty (like the main relay) the the chances of picking up another faulty item from a wrecker is slim.
A quick search through the yellow pages indicates these people may be able to help you out:
AAA Honda Recyclers
If It's A Honda Part You Need, We'll Have it.
19 Carole Rd Maddington WA 6109 - get directions
ph: (08) 9459 3933
send to mobilemore info
Best of luck with the car and be sure to post some pictures for us.