Anyone know of a reasonably priced sushi guy who will come to yr house and make sushi for parties?
Make your own sushi, it's cheap, fast and a lot of fun!
I bet you could buy all matter of sushi making supplies (knife, plates, mats, etc.) that you can re-use for what you are going to pay a caterer.
How many people are you looking to feed? What is your budget?
I know of someone who charges a flat $50/head for parties of 10-15 people, all you can eat (typically, unless you have an unbelievable appetite).