AdventureBid.com
Bid on outdoor adventure packages with no obligation. If you don't buy the package within 48 hours, the next-highest bidder gets a chance.

Bid4Vacations.com
Choose from a variety of auctions, including spa vacations and family getaways. The service started in April, 1999.

Concordia Luxury Link
If "budget travel" means saving big money, this is the link for you. But you'll still pay big money for many of these trips--it is for luxury travelers only.

Going Going Gone - Travel Auction Network
Auctions from Travel Clearinghouse run Tuesday to Thursday for domestic and international packages.

Inntopia
Here you can bid on rooms throughout the U.S. and 58 other countries.

Last Minute.com Auctions
UK-based service where they say the bids are legally-binding. Bid on vacation packages, lodging, airfare. Currency listed in pounds.

Net Travel Auctions: A Route to Bargains?
By Laura Bly, USA Today. Laura's first-person account of her experience with travel auctions is entertaining and instructive.

OnSale Vacations
From Egghead On Sale, they offer worldwide variety. Bids start at $9 USD.

Priceline
This much talked-about site is not really an auction. You submit how much you would like to pay and they send you back a yes/no answer.

QXL's Travel Auction
A menu of travel package leaving from London and quoted in British pounds.

SkyAuction
The name is a bit misleading--it's not just for airfare auctions. There is no "reserve" here--in other words, they don't cancel your transaction if the winning bid is below expectations.

TravelBids
The concept here is to give you many travel agencies from which to choose, in hopes one will meet your trip/price expectations.

Yahoo! Auctions - Travel Tickets
A huge selection of auctions involving air travel, cruises, resorts, family vacations, and miscellaneous travel items.