AT&T Selling 3G iPhone Without Contract At Premium Price
AT&T announced that the 8GB 3G iPhone, sold without a contract, will be priced at $599, while the 16GB model will be priced at $699.
http://www.dbtechno.com/phones/2008/07/02/att-selling-3g-iphone-without-contract-at-premium-price/
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i think vodafone's price for 8G iPhone 3G will be around $799 NZD(with out contract).