Can I buy the S4 off contact?

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http://forums.androidcentral.com – I went into a Sprint store and they said they won't sell me a phone without a contract renewal. Which seems a little illegal or something to not let someone buy a product you sell, but I don't know. The website says the S4 is $599 so can I just buy the phone for that price from the.Sprint website? Sent from my SPH-L710 using Tapatalk 2 (HowTos)