Outside of bulk buys I generally pay for a 5kg express bag packed with whatever spec grains I need. I've found since I moved down here I've simplified what I keep in stock seeing as Craftbrewer is no longer a 15 minute drive away.
If I'm down in Hobart anyway, I'll stock up on some spec malts in 5kg lots - they are pretty good value for non-bulk buys.
But getting involved in the bulk buys is a big thing for me - it saves a packet of money.
Hops - generally via Yob at hopdealzaustralia.com. Before he came along, I'd get larger quantities from the US from Niko or Yakima valley hops, but with him there, I can get almost bulk buying prices without kgs of hops sitting in my freezer for too long.
out of interest, how much is base malt per kilo roughly if you buy from either of the hobart stores? obviously it varies from grain to grain, but just to give me the idea of how much a 23L BIAB grain bill would cost.