Yes, this is possible. 

“I Buy Fast”
Check vehicle listings for buyout options. If you’re willing to pay the buyout price on an item with the “I Buy Fast” designation, you’ll automatically win the auction before it goes live. The best way to find these listings is using advanced search under “Auction Type.”

Future sale
Unfortunately it is not possible to purchase a vehicle that is marked as 'future sale' until the auction date has been set AND the vehicle is marked with the “I Buy Fast” option. 

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