Australia is very expensive. To illustrate just how expensive it is, here are some cost comparisons that a friend put together. Depending on where you live, the US prices might be a bit different but it will at least give you a general idea.
US- $10 Oz- $24
US- $400 month Oz- $350 week
US- $3.40 gallon Oz- $3.40 liter
US- $4 for 20 oz. Oz- $4 for 8 oz.
US- $4 for a pint or $8 for a six pack Oz- $10 for a pint or $24 for a sixpack
US- $4 Oz- $8
US- $.50 per pound Oz- $17 per kilo