How to use NFC with RFID tags/chips

When I bought my Samsung Galaxy SIII, there was a big buzz about the new phones on the market supporting NFC (Near-Field Communications). However, given that Blutooth exchange of files and even the somewhat more powerful Wi-Fi Direct protocols were already available to allow files to be exchange, it seems to me that yet another technology (NFC), when used to transfer files, doesn't add much to what was already available.

Hence, the true value of NFC should be its ability to read RFID (Radio-Frequency Identification) tags. However, I have not been able to find any of these devices anywhere, and I'm not sure if it's because these are less used abroad where I am living or not. So, where can I find these devices?

Thanks.