you can buy them directly thru the mint website. there rolled in blue wrapping. I imagine if the mint does not sell all they have to offer for the year then they dump them into circulation
I don't like the "NFIC" term. I prefer "CDO"... Collector Demand Only.
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I think there have been mint sewn bags sold before.... or the 'dumping into circulation' idea seems plausible. I have found bulk semi-BU 1994, 1996, and 1997 halves on multiple occasions.