I have been looking at bows lately myself. I used to shoot a compound hunting bow during college, but never hunted with it. I had borrowed it from a friend who was about my same height and build, so it was easy for me to draw and shoot.
You could get something decent on ebay I would imagine. I would recommend researching and holding them before spending a good bit of money on one.
If you do look at used bows, don't be concerned if there is a
slight amount of rust on the screws on the bow. Humidity does that, and many of the ones I have been looking at have this characteristic.
Here is an example of one I looked at:
ebay listing
If you really want to set it up yourself, you may not want something like this. This example already has sights and comes with a few accessories. It started at a decent price.