You can find the Sportsman rules in section 4.2 of the SPARC ruleset.

We have a suggested donation of $20 per bot to help cover our costs.  WAR events are Free for builders but we do have storage, arena maintenance and other event related expenses.  All of the money we collect goes to the Seattle Robotics Association which is a registered 501(c)(3) non-profit.  Please donate if you can but donating is not a requirement to compete.