You can purchase an item immediately without going through the bidding process by clicking BuyNow!. This ends the auction.
Bidding equal to the BuyNow! price:
If you enter a bid equal to the BuyNow! price in the maximum amount, you will not immediately win the item. Entering a bid equal to the BuyNow! price is not the same as using the BuyNow! option. You must click BuyNow! to immediately purchase the item at the BuyNow! price.
Items with a Reserve Price:
Once the bidding for an auction meets or exceeds the Reserve Price (the minimum amount the seller is willing to sell the item for), the BuyNow! feature is disabled, and the auction runs until its scheduled end.
If there is not a Reserve Price, the BuyNow! feature is disabled if the bidding meets or exceeds the BuyNow! price, and the auction runs until its scheduled end.