What is the value of an 1809 -1817 James Madison gold dollar?

If you got it in change it's only worth $1. It's not from 1809 and it's not gold. It's one of the brass $1 coins struck as part of the Presidential dollar series.

The dates 1809-1817 are the years he was in office. The minting date is on the edge - look closely and you'll see that it was struck in 2007. Four coins are being issued every year, and each one shows the dates that the particular president was in office.