Can I buy an iphone without contract?

Many carriers advertise that the iphone cost under 300(generally) but WITH a 3year contract (on selected plans) which means that, yeah I get the iPhone at a low price but I'll also have to pay the monthly charges which are at least 60 $.

Therefore, I decided to buy it without contract (cause it will be less expensive) but I wanted to know if the carriers will still have other monthly plans…

Added (1). Will they let me buy the iphone at the normal price and offer me cheaper plans?

You can try craiglist

Yeah you will have to use Wi-Fi & I think you would be charged for call and text. Maybe. But it will be super expensive, like $800 for no contract iPhone 5 and maybe $300-$400 for a new iPhone 4/4S. Try buying one from Craigslist or eBay. I doubt they would come with a phone plan. Without a plan, it's more expensive.

With no contract youll have to full price.

iPhone 4 = $450
iPhone 4s = $550
iPhone 5= $649-849

Obviously you still have to pay a monthly plan but you have the freedom to go to any other service.

This is by far the cheapest plan available and it includes iphones:
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Starting on January 11, 2013 in more than 2, 000 Walmart stores and online at Walmart.com, customers now have access to the iPhone 5 and iPhone 4 on Straight Talk's $45 no contract unlimited talk, text and data plan. To make this offer even more affordable, Walmart will be offering customers who purchase the phone in the store, a no interest fixed-monthly payments special financing offer for only $25 a month with a Walmart Credit Card.