Hey Lou, most of us get our grain from G&G or keg king when we are in the city (or do a special run for it). The good folk at Ripon Street charge an arm and a leg for grain - they can't keep up with AG needs really (and they don't really try to, I spoke to Wayne and Averil about that many times, and the new bloke is aware of the cost problem also).
I think if you have a contact/someone who works at JW you might be able to find a way in, but they don't sell direct to individual home brewers. I'm still going to let you know when I next brew also mate, I've just been a bit busy and my last brew is a lager so its tying up the system a bit longer than usual.
jibba: 4 bags is a bad run! I only use their trad ale and their 'export pilsner'. I don't like their spec grains at all.