Manage costs online of the entrance fee for an intramural soccer team

The guys on your floor want to sign up for the intramural soccer team being organized by Student Activities. You decide to take the lead in getting the team together by leading the collection effort for the entrance fee. You also think it'd be a good idea to collect some money for t-shirts you can all wear as uniforms to set you apart. You've already started bugging the guys, but their enthusiasm for soccer is greater than it is for paying up, so they make excuses. You need a way to cut through the excuses.