You can expect to pay anywhere from $20 to $100 or more.
To get a precise price, I recommend:
* Checking online retailers: Search on sites like Amazon, eBay, AutoZone, Advance Auto Parts, and Napa Auto Parts, specifying "2000 Ford Taurus ignition switch." Be sure to compare prices and reviews.
* Visiting local auto parts stores: Go to your local auto parts stores and ask for a price quote. They can look up the part based on your vehicle's VIN.
* Contacting your local Ford dealership: They will have OEM parts, but they'll likely be the most expensive option.
Remember to factor in the cost of labor if you're not installing it yourself.