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]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

VENDEE, contr. A purchaser; (q.v.)  a buyer.