The best resource for finding a 1989 Suzuki Samurai to purchase is Craigslist via SearchCraigslist.org. SearchCraigslist.org is an unaffiliated extension of Craigslist that allows buyers to search listings from all over the country rather than a single locale.
The Suzuki Samurai was discontinued in 1995 for safety reasons, but used models can still be purchased from current owners. Ebay.com/Motors is an excellent tool for purchasing cars and parts. Another great resource is a Suzuki forum such as ZukiOffRoad.com. Car forums can unite sellers with buyers through word of mouth or member message boards. These sites typically host classified listings as well.