I called Team Nissan in Manchester NH for the shaft assembly. The price they gave me was $450. Went to
www.nissanparts.cc and $342.06 + $34.21 shipping is what they were asking. I called Team Nissan back and asked if they could match that price. The parts guy said he would sell it to me for 331.03 (25% off). Not too bad! The kit that autozone has is just the axle shaft.
BTW - 98'-02' frontier and 00'-02' Xterra's have the same axle/cv setup.