Buying Phones

Well I always hear people talking about getting new phones all the time and well I always thought that buying a new phone lets say every 6-12 months would be extremely expensive. Well I myself get bored of my phone pretty fast but never get a new one because of the cost and well I was just wondering a way to get new phones but without paying $500+ I want to try eBay but I just don't trust it with all the talk about people getting ripped off. Have any suggestions??

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