There are websites where a person can complete (online) and print a will for free. Some are completely free, including long-term storage of your will (warning: some of the "free services" ask you to pay for printing or storage). One of the totally free sites can be found at http://www.freelawyer.com/. Once you have completed and printed the will, you simply need to find a moment to have witnesses and yourself sign the completed will for it to be valid.
Free printable will forms can be used to draft a will which can then be signed in front of witnesses. When writing out a will it is important to make arrangements for all personal possessions, and many websites advise that clients have the final will reviewed by a lawyer. www.alllaw.com/forms/wills_and_trusts/last_will_and_testament