heartbomb

Hi all--

I was subscribing to the cheapest sprint plan (the $29.99/month one) and they had given me a samsung A560 phone. Well my toddler got a hold of it and it met an untimely death in the toilet. I tried to rinse it out with distilled water and a new battery but it still wouldn't start. So I wanted to buy a new phone. I found an unlocked phone on amazon that I like, a Nokia 3595 Phone (Unlocked), and wanted to buy it. But i have a bunch of questions.

I read elsewhere unlocked meant that the phone can be used with any provider. However this one says that it doesn't come with a sim card. Here's my question. My old phone didn't have a SIM card in it. Do I need a sim card for this phone to work? and if so, where do I get one? and how much will it cost?

Thanks!