Firstly wowzers about the 16 X 10 hehe!
Umm, there's a place in Heidlberg West called 'New Way Motor Wheel Repairs' - if you know the area, they're at the industrial end of Waterdale Road (North end). You can also try 'Advance Wheels' on the Nepean Highway - I think they're kinda just near Brighton or something ?? (No, I don't live near there!). AFAIK
, 'New Way' charge $99 (Inc GST) to repair a rim, but if it needs painting, add another $50. Also, depends on how damaged the rim is too - if it's too damaged, there's a possibility that they may not be able to repair it and hence you're outta luck with one bung rim :-(. Still, give them a call (Colin / David) 9457 3141. Friendly / no BS guys too !