Okay, round up for Melbourne....
JB - $99
DSE - $99
Big W - didn't check if they had it in stock, but I gather $94
Target - didn't have any, so no idea
Zoneadrenalan - apparently $79, $74 if you pay cash, but they are out of stock. Also, they import, so take that into account for if there's DLC down the track
Dungeon Crawl - $99 if you're on their mailing list. If you're in Melbourne, you should
be on it.
I picked it up from DC, as I'd prefer to support the awesome private games shop over the big corporations. They're getting the Collection back in stock soon apparently, $69 if you're not into importing over the net.
Didn't bother checking EB, have a guess why