What is the Best Offer option for?
Best Offer is available for listings using the Fixed Price and Classified Ad formats, and in eBay Motors. Best Offer is not available for auction-style listings. With Best Offer, you give buyers a chance to negotiate with you on price. Visit eBay for more information on this feature: http://pages.ebay.com/help/sell/best-offer.html. Please note – Best Offer is only available for use on certain categories.