Buyout auction is an auction with an additional set price (the 'buyout' price) that any bidder can accept at any time during the auction, thereby immediately ending the auction and winning the item.[29] If no bidder chooses to utilize the buyout option before the end of bidding the highest bidder wins and pays their bid.[29] Buyout options can be either temporary or permanent.[29] In a temporary-buyout auction the option to buy out the auction is not available after the first bid is placed.[29] In a permanent-buyout auction the buyout option remains available throughout the entire auction until the close of bidding.[29] The buyout price can either remain the same throughout the entire auction, or vary throughout according to rules or simply as decided by the seller.[29]
Many financial assets, especially government bonds, are issued by an auction. An important feature of the design is the auction pricing mechanism: Uniform vs. Discriminatory. Theoretical papers do not provide a definite answer regarding the dominance of one type of auction over the other. We investigate the revealed preferences of the issuers by surveying the sovereign issuers that conduct auctions. We find that the majority of the issuers/countries in our sample use a discriminatory auction mechanism for issuing government debt. We use a multinomial logit procedure and discriminatory analysis to investigate the mechanism choice. It was interesting to find that market oriented economies and those that practice Common law tend to use a uniform method while economies who are less market oriented and practice Civil law tend to use discriminatory price auctions.

Private treaty sales – Occasionally, when looking at an auction catalogue some of the items have been withdrawn. Usually these goods have been sold by 'private treaty'. This means that the goods have already been sold off, usually to a trader or dealer on a private, behind-the-scenes basis before they have had a chance to be offered at the auction sale. These goods are rarely in single lots – photocopiers or fax machines would generally be sold in bulk lots.
Silent auction is a variant of the English auction in which bids are written on a sheet of paper. At the predetermined end of the auction, the highest listed bidder wins the item.[43] This auction is often used in charity events, with many items auctioned simultaneously and "closed" at a common finish time.[43][44] The auction is "silent" in that there is no auctioneer selling individual items,[43] the bidders writing their bids on a bidding sheet often left on a table near the item.[45] At charity auctions, bid sheets usually have a fixed starting amount, predetermined bid increments, and a "guaranteed bid" amount which works the same as a "buy now" amount. Other variations of this type of auction may include sealed bids.[43] The highest bidder pays the price he or she submitted.[43]

The District of Columbia now auctions its surplus property online through GovDeals, a Liquidity Services, Inc. marketplace. The district awarded the contract for the management of the inventory, appraisal, sale and shipping of the city's surplus property to Liquidity Services Inc. LSI conducts auctions of city assets such as vehicles, police automobile accessories, computer equipment, radios and other communications equipment, office furniture and other supplies through its online marketplace. The auctions are expected to improve data tracking and financial oversight of the city's surplus asset disposition activities.