Here's another way to calculate it. Figure out what you paid for it originally and then divide that in half. That's your starting point. If you cover is in poor shape, subtract about $500. If you haven't maintaned it well or if it has any mechanical or electrical issues, the discounts could go deeper. Reselling a spa is not an easy thing to do but there are a LOT of poeple out there that have set a price limit on what they are willing to spend. Many of them (as I original did) set that figure at $5K. After a while they find out they can't get a "quality spa" (like you Optima) for that level. But they SHOULD be able to buy a used one for that level. Some have paid as low as $2,500 for an older Optima in need of repairs, covers, etc. Others have paid as much as $4,000 for one in good shape. Good luck!