apologies for the late reply... im really not able to give out their contact details over the net, so you'll have to do some searching, but yeah.
in melbourne, you can a fairly decent bass for about 3500, if you have that much. but you can get away with 2000-2500. but that said, ONLY go to ben puglisi's bass store in hawthorne. he really is the only one around that will give you a good bass with a good setup at a good price.
from here... id email or ring up Ben Puglisi, for contact detaisl go here...
http://www.benedictgpuglisi.com/ and tell him you want to play double bass, what style, and that you might like some help finding a teacher and he'll sort you out.
good luck with it!