Catseye
Aerowasp Helicopters near Wollongong ( approx 1 hour south of the Sydney CBD) provide training on the 300 and to my knowledge are the only company in the Sydney area who do so.
Chief Pilot is Peter and you can phone him on 02 4256 8444.
You can check out the website by going to
www.google.com.au and typing in 'Aerowasp Helicopters".
Any further info required then PM me.
Cheers
heli_spy