Massey, check out the price per ounce between Perth mint and other companies. ABC Bullion has cheaper gold per ounce than Perth Mint. Here's their website:
Also, just as a heads up, the kangaroo oz (gold) is more popular/in demand than other forms of bullion (you may have known this). It's really pretty- costs a bit more, but gold bullion is really for keeps. Your grandkids will thank you for it.