You want a good bow cheap get a list of the brand names you want, like Mathews, Hoyt, Parker, Pearson, etc and check on Ebay. You just need to know what weight and draw length you want. Go to a local shop and shoot a few of them and then look on Ebay.

If you want to buy it new then obvioulsy go through your local shop/dealer. I always support the local guys and spend the extra money. The Hoyt Havotec on Ebay linked below is a great bow, I used to own one and it cost me over $600 when I bought it new 4 years ago with nothing on it. Examples:

http://cgi.ebay.com/Hoyt-Havoc-Compound-bow_W0QQitemZ7186652193QQcategoryZ36101QQrdZ1QQcmd ZViewItem


http://cgi.ebay.com/Mathews-Q2XL-29-Draw-length-70-lbs-max-RH_W0QQitemZ7187327544QQcategoryZ111251QQtcZphotoQ QrdZ1QQcmdZViewItem