One option is to look at a "package" deal. Don't foprget that in addition to a bare X-Bow you will need bolts, broadheads, and probably a co*cing rope ... probably a carry case ... and a sight system if the X-Bow does not come with one mounted. I suspect that by the time you are done, you will be well into $400 at the least.
If at all possible go look at the models that you are considering. Fit and feel are going to be a big part of you being able to shoot comfortably and accurately.