New? All you can do is watch for sales from your carrier or stores like Best Buy, Radio Shack, and the like. Also check Amazon and ebay (but be careful who you buy from on ebay).
Used, watch Craigslist and ebay. Ditto on the warning above.
I got one for my wife through best buy, walmart had it for $59.99 a week ago and they price matched it. I'm a huge fan of best buy customer service, that's y I went with them over walmart
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