Make an Offer.

If the seller is selling an item using ‘Buy it Now’ and it still hasn’t sold when the auction is about to end, use eBay’s ‘Best Offer’ service to make them an offer on it. The chances are they’ve listed the item two or three times before, and they’ll be so annoyed at the prospect of re-listing it yet again that they’ll accept your offer just to get rid of the thing.