Oh man, extra money at the end of the year, wonder what that feels like...
Entering off-season competitions are always so much fun. So much of the pressure is gone because it hasn't been an insane few weeks before and afterward and your minds aren't going into robo-overload.
Obviously stocking up on the tools is a good thing to do, however don't forget other factions of your team. Do you have some sort of a PR team? Maybe they could use some materials to help them out. An animation team? Perhaps they need a new mouse or two. (ok, that probably wasn't a good example, but you get what I'm saying)
The money could also be used as seed money for summertime fundraisers (pasta dinners etc)...
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This season, I was a part of a great team, with great kids who were really inspired, and who inspired me back. That's my brag, what's yours?