What is the value of a 2000 p Jefferson dollar coin?

There's no Thomas Jefferson $1 coin dated 2000.

A 1-oz silver commemorative "dollar" was made in 1993. These sell for roughly the price of 1 oz of silver at current market prices, which change every day.

A brass circulating dollar was minted in 2007. These are part of the Presidential Dollar series and are only worth $1. If that's what you have feel free to spend it.