Yes, some of the buy now cars have auction fees whereas some do not. Auction fees vary by the auction and the selling price. Auction fees typically range from $200-$600 USD.
If you buy a car from auto auction website at fixed price, the auction fees tend to be much lower than for the live sale vehicles. However, auction fees vary depending on how much the car is sold for, the higher the bid, the higher the fees. Unfortunately, the auto auction companies has no control over auction fees.
For more information on these fees, please refer a request to a particular car auction website.