Frequently Asked Question:
How do I use the Best Offer option on my listing?
For categories that allow it, there will be an additional set of options in the Price section of the one-page lister. If you mark the checkbox next to "Accept offers from
buyers," then you can enter the auto-accept/auto-decline prices that will determine what happens when people send you their offers. Visit eBay for more information on this feature: http://pages.ebay.com/help/sell/best-offer.html.