By 5PM EST on the Tuesday following a regional in which you qualify at, you must contact FIRST Finance with payment information in the form of either a check, a credit card, a purchase order from school, or a commitment letter from your sponsor. However, in the case of either a purchase order or a commitment letter, you do not need to pay it until sometime before 4/06/07.
SOURCE:
http://www.usfirst.org/community/frc...nt.aspx?id=460