no you cannot import a car yourself from yahoo auctions .. you will need a broker..
2ndly, becuase its an 89 car, the only option is to hold it in japan until 2004. Prestige is offereing this for free at the moment which is a very good deal. Prestige are only a broker, so the only money they make is the 1000 service fee. You will not that it was an approx price of 600,000 yen ... on yahoo it shows the reserve of 500,000... so they are assuming that it wont sell for too much over the reserve.
Btw - i have never used prestige, but many people hear have and they have had very good feedback.