The postage for most suppliers is based on a percentage of the order value. 30% seems the most common to Aus. The problem with this is that it hikes the price up for things like minis but totally undervalues it for things like magazines, paints, rulebooks, boxed games etc.. basically anything with substantial weight.
Like I said earlier, if you were to buy 3 harbinger magazines... you would pay a percentage of that order as postage.... in this case (at 30%) that would cost about £3.00. The actual cost of posting that order from the UK to Aus including packaging will be closer to £9.00 due to the weight... that means that the store would lose £6.00.
The minimum postage tries to cover this.
Another problem is sending something like a vallejo paint set of 60 colours or a boxed game like Hybrid. These exceed the maximum airmail weight of 2Kg, so therefore have to be sent in two or three separate packages. This means two or three times the postage cost for the store.
The only way around this is to weigh and input every single item\'s weight. This again causes problems for pre-ordering new releases....
At the end of the day.... you\'re buying a product from the other side of the world... £7.50 doesn\'t actually sound that much to me.... and as Jack Dee said... try taking it youself for that price.