The Collaborative International Dictionary of English v.0.48:

Vendee \Vend*ee"\, n.
   The person to whom a thing is vended, or sold; -- the
   correlative of vendor.
   [1913 Webster]

WordNet (r) 3.0 (2006):

vendee
    n 1: a person who buys [syn: buyer, purchaser, emptor,
         vendee]