How much do NFC tags cost to manufacture?

Maybe this isn't the perfect place for this question, but since NFC is most prevalent on Android devices at the moment, it's the best place I could think to ask.

The reason I'd like to know is this: all this talk about home automation has got me thinking: what if every single item of food I bought on a daily basis had an NFC tag built into the packaging? What if I had an app on my phone that could literally swipe the tag on each item when I bring it home and load it up into the fridge/pantry, and then swipe it again when I've finished/thrown it away? Is that sort of thing financially feasible? If not, how soon could it be?