Speak to Southern Bay, Brewpak, Gage Roads or Independent distillers - they will give you a better idea. From my discussions with one of the brewers at SBBC, the price is tiered depending on what you supply i.e. own malt, hops, yeast(?) and even components of the packaging side, such as sourcing your own labels. The brew length at SBBC is 60 hL from memory, so hopefully you've got a pretty good marketing strategy or have a lot of the beer already pre-sold before you have 120 kegs or so to move!