You can add extra copies of Movable Type to any pledge level for €13 each.
If you want only two copies, your most economical option is to pledge at "Editor" level. For €25 + €5 shipping, you will get two copies.
If you want three or more copies, you should pledge at "Editor" and add €13 for every additional copy that you want. So three copies would be €25 (pledge for two copies) + €13 (third copy) + €5 (shipping) = €43.