The classifieds are a good place to start. In addition to what Apex Predator said, I would add that grip size and shape can be critical to shooting well. I know, with my short fingers, a large grip just won't work. I can shoot it but not with anything like consistency.
Like MANY of us here, the classified ads provide me the opportunity to try high quality bows at less than new prices, then trade if they don't fit me without taking a great loss (sometimes only shipping). The fact that someone wants to sell a bow here does not mean it is a bad bow, only that the bow may not be "the one," if there is such a thing. Some of us discover that the one we just sold, may have been "the one" so you will occasionally see ads seeking to buy a particular bow back.
If this is starting to sound like some sort of illness or addiction, you are getting the right idea. Welcome aboard!