If you know of anyone who currently owns a timeshare there is a website called RCI.com. You'll have access to Bonnet Creek and many others for a fraction of the price you'd pay through any other site. We've done it for the last 10 years. This coming May will be our 4th trip to Bonnet Creek using RCI

, it's by far the cheapest way to go. Having said that, the next best thing would be ebay. Make sure the seller has a perfect or near perfect score, and you should be ok, just be more cautious.
Hope that helps.