What do you actually need at the roll down? Do you pay the full registration? And I seem to remember that they only accepted certain types of payment (they only accept checks, they don't accept checks), or am I making things up? The Athlete's Guide is pretty vague other than that you have to be present to claim it. I would usually just plan to have a credit card handy.

Note this is probably academic for me but let me tell you, if I have a good day and get lucky with roll downs, I'm not missing my chance because I forgot my whatever.