If you don't have any takers on your Second Chance Offer, you can always try to sell the item again by relisting the item. See Chapter 21, "After the Sale: Concluding the Transaction," for more details.
The Absolute Minimum
Here are the key points to remember from this chapter:
If 7 days go by with no contact from the high bidder in your auction, you probably have a deadbeat on your hands.
After you've made all reasonable effort to contact the buyer, file an Unpaid Item Dispute with eBay.
Wait another 7 days, and then close out the dispute to receive a final value fee credit from eBay.
You can try to sell the item in question by making a Second Chance Offer to other bidders, or by relisting the item in a new auction.