Why does the iphone 5c cost really low online?

I went to sprint and the price is $00 but i don't know why it would be free* is there any catch to it
For example other phones cost alot less online than there worth at stores I don't see why? Any catch?

The discounted price is with a 2 year contract.

Also, Sprint is giving an extra discount on the iPhone because it's normally supposed to be $99 with a contract.

Kate is correct it is with a 2 year contract. But prepaid is cheaper.

Sprint: $80/month + at least $10-$20 taxes and fees for Unlimited Talk/text and data
after 2 years you paid at least $90/month and you were bound in a contract

Virgin mobile: $55 unlmtd talk, text, data + one time fee of $500 for iphone
after 2 years you paid $75/month flat.

Total savings of $360 after 2 years with no contract!

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