Straightarrow has some good advice for you. In my local pawn shops I often see High Country, Mathews, Martin, PSE, and other excellent bows going dirt cheap. They almost always are fully set up with sights, arrow rest, quiver, etc.

You do need to know something about what fits you. Take an experienced friend along to help make your selection. I usually see lots of good used bows showing up in pawn shops after the season is over and just before the Holidays.
Good luck.