Does anyone know where to find .016 wound individual guitar strings?

[Rockette]

You can find .016 steel singles anywhere, but I've not seen a wound one in that diameter. D'Addario does make a wound .017 though:
http://accessories.musiciansfriend.c...ing?sku=120801

If you're just looking for .016 string singles, go here:
http://www.juststrings.com/jsb-016p-1.html

or here:
http://accessories.musiciansfriend.c...ngs?sku=120016