What is the value of a 2004 Louisiana Purchase nickel?

It's an ordinary circulation nickel from the Westward Journey series, issued in 2004-2006 to commemorate the Lewis and Clark expedition. Hundreds of millions were struck so they're not rare. If you found it in change it's only worth five cents. Uncirculated or proof-condition ones might retail for $1 to $4 depending on how nicely struck the images are. A lot of people see the 1803 date on the back and mistakenly think that's the year it was minted. That's the year that President Jefferson signed the Louisiana Purchase agreement. If anyone tells you they've found a new-looking "1803 nickel" ask them if they turned it over and checked the date on the other side!
Five cents.