It is free, but if you want to send something back, I am looking for the following cars.
AutoBacs ARTA Garaiya #43 '03
Infiniti G35 Sedan '03
RE Amemiya Asparadrink RX7 #7 '04
Toyota au Cerumo Supra #38 '01
Toyota Corolla Rally Car #9 '98
Volkswagen New Beetle Cup Car '00