list one without PS or OS on Ebay, see what it does, you might find people who have one and want a spare. For testing the water, I liked using the 10 day deal, start it on a Friday afternoon, let it run ten days. Then you'll have a good idea what a buy it now price should be. Sometimes when I had multiple items, I'd only list one at a time, as if it was the only one in the whole wide world, then after it sold, I'd list the next one ; )