Have you looked at Query Tracker? That site is a nearly perfect comprehensive list of every agent working today, and you can search by your novel's genre and see who's currently accepting submissions. You can also look at MSWL (Manuscript Wish List) sites here and here and see what agents might be looking for books along the same lines as yours. Following agents on Twitter also opens up a lot of doors, since the publishing world is small and they all interact with one another frequently.
It's work, and you have to be a go-getter, but you should be able to find dozens of agents seeking new clients when you do a little research.
A slightly larger concern: You say you finished your novel last month. Does that include letting it rest and looking at it with fresh eyes? Have other people read it? Giving a novel breathing time and letting other people read it and give you feedback is essential to its success. Other people may pick up things you might not have, and you don't want to close too many doors before you've made your the novel the best you can make it before sending it out.