What is the value of an 1803 Louisiana purchase nickel?

Uh, turn the coin over. You'll see the actual date - 2004.

It's one design in the Westward Journey series minted to commemorate the 1803 Louis and Clark expedition. With mintages in the hundreds of millions, a coin you get in change has no added value (and probably never will). Uncirculated rolls are selling generally in the $3 to $5 range at coin shows.