Buying over the Internet, or online, is a no brainer. It comes down to two things, choice and cost.
There are only four and a half million souls living in God's Own, which means the consumer market is no bigger than Sydney's.
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If you're a consumer of books for example, and if you read them on the kindle rather than lugging a seven hundred page heavyweight around in your bag, then you've got no choice but to buy them online.
My current read is Stalin's Daughter which you can purchase online here from Whitcoulls for thirty five bucks for a hard copy, with other sites selling the same tome for around the same price, give or take a dollar. No kindle version's available here but it is on international Amazon where, with the click of a button, it's transferred to your portable screen for less than 23 bucks.