What were the two slave auctions called?

The standard practice seen in a livestock or fine arts auction today in which the highest price bid at auction obtained the property. In other Words, the product was sold to the highest bidder. The second type was more of a wholesale auction which was used to rid the slaver of any excess inventory or damaged goods. This was referred to as a Grab and Go auction. It was more of a fire sale or going out of business sale.