help! caterer for party

help, please. I'm giving a smallish (between 50 and 75 people) standup after-work cocktail party in a Manhattan apartment to launch my brother's new book. we can buy the wine and rent glasses ourselves, but need waiter and bartender (who will also clean up), and a few reasonably interesting hors d'oeuvres. so far the only caterer we've talked to wants about $2,000 including paying waiter and bartender. This is about $500 more than I can stand to spend. any suggestions?