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I don't think we have any Verizon employees on this forum that post often enough to really help you...you'd probably be best off calling your local store and asking honestly.
90% of verizon stores have no extra Nano Sims in stock, only the ones supplied in the iPhones that were shipped to them. I wanted a second nano-sim so I could use my iphone for both my work and home lines by just swapping the sims out (i use a galaxy nexus with a sim adapter as my second phone and I like the availability to switch between the two). I ended up having to call a special branch of verizon's tech support to get a new nano-sim shipped to me, but it was free so meh