Shop around on the forums until you find a good deal on a used one of these. Probably the best bang for the buck there is out there for a top quality peep sight. You can get different apertures if you like, or just screw the aperture out and you have a ghost ring sight. Take your time and you will find one, I see them all the time.
Avoid the fiber optic stuff. Too much plastic for me. I have seen far too many of them break in the field. Tom.