Same brakes?
Well, by now you've probably found
www.harrop.com.au They're a big name in aftermarket race/performance parts, as most Aussies would know.
There is also DBA (Disk Brakes Australia) making OE std and better brake rotors. See following link for DC5 and earlier listings, including dimensions. They have a great reputation also.
http://www.dba.com.au/dba_catalogue_200 ... /Honda.pdf
They quote 300mm diameter "fits Brembo caliper" setup.
Can't really comment about your squealing, but it dosn't sound real bad. You can mess around with anti-vibration clips and glues to hold the pad completely still in the caliper, but often it comes down to pad compound (new/different pads) and a freshly machined (or brand new if it's getting thin) disk, which is kinda expensive if the current parts still have lots of life in them.