1. $4,000
2. Payment for a second event is due to FIRST by January 28th, 2011. If you reasonably believe you will raise the funds to attend a second event I would register tomorrow to make sure you get a spot.
FIRST will not charge or penalize you if you drop the second event before that date (they will issue a full refund if you have already paid).
Answers taken from:
http://usfirst.org/roboticsprograms/...nt.aspx?id=460