so since im not from Australia its hard for me to say where.
however i do have some things you can look for (this might be saying the obvious but whatever)
first of all on my print bed i use the GP8200, this is a glass plate provided by velleman for the k8200.
its tempered glass for heat reasons of course and basically if you cant get that any tempered glass of about 20cm by 20 cm will work
also Ikea used to have mirrors called sorli they came in a 4-pack and were cheap, sad thing is that they stopped selling them, but maybe your lucky and are able to find some.
for tape i always use TESA 4308. (blue paintertape) so loyal DIY store maybe http://www.tesatape.com.au/industry/general_applications/masking/paper_tapes/tesa_4308,i.html
hope this helps in any way.