Around 00 and 01, friends of mine used to always score (usually only weed) in the side streets around rundle mall in the adelaide cbd. Usually it would be off the rannins* that are always sitting around doing sfa. They didnt really advertise to people though, you'd have to go and ask them if they had anything. I dont know if its like that anymore, since I dont really visit the mall very often at all, and me and my friends aren't stupid enough to buy off random people anymore. The last time one of my friends tried to score in town, he got his money stolen.
*rannin - by this I mean those young people who are decked out in their $5 bright dada outfits and look like they take a shower maybe once a week. They also are pretty much always seen with their gang/crew/whatever lame shit they call it. [Broad generalisation] most of them are dodgy cunts, and best avoided [/generalisation]