I don't spend a lot of money on costumes EVER. Last time he dressed as a hippy and I dressed as a mime (together we were "Peace" and "Quiet") - the only money we spent was for the white makeup on my face and the tie dyed shirt for him (which was a souvenir from grand cayman).
Another year we went as smartie pants (taped packages of Smarties candies to our pants) - cost of candy $2
October 1997 Princess (Bahamas)
October 2000 Carnival Tropicale
October 2006 Carnival Miracle
October 2009 Carnival Legend