Mario & Nintendo KNEX Building Sets $3.99 December 3, 2012 by // by SMFM Leave a Comment Mario & Nintendo KNEX Building Sets $3.99 Mario & Nintendo KNEX Building Sets $3.99 – Head on over to Amazon has Mario & Nintendo KNEX Building Sets for only $3.99 and they ship for FREE with your Prime Membership or any $25 order. Grab This Deal Here