Striaght from Wikipedia
Every player receives a stipend for participating on Survivor depending on how long they last in the game. The known prizes for All-Stars are as follows: 2nd = $250,000; 3rd = $125,000; 4th = $100,000. In most seasons, the runner-up receives $100,000. Sonja Christopher, the first player voted off in Survivor's first season, received $2,500.  Tina Wesson, the first player voted off in Survivor: All-stars, received $25,000. The prizes in seasons with more than sixteen contestants are unknown.
The million-dollar winner also wins an automobile, as does the winner of a specific reward challenge in each season (excluding the first). All players also receive an additional $10,000 for their appearance on the reunion show.