If you have an appliance that is in new condition or is gently used, then these appliances can be sold and are usually in good demand. You can try to sell the appliance at a garage or yard sale or to a local appliance reseller. In either case, clean it up and make sure you have all its parts. Appliances with missing parts have much less value than complete units. If you have the original packaging and product manuals, that is a bonus.
As for price, consider what you would pay for the item if you were doing the shopping at a yard sale. Do not expect to get near the full value or even close to half price for an appliance, even if it has never been used. If you want to make the sale that day, then you should have an electrical outlet handy so purchasers can try the appliance before buying.