Nickelbids is a small Penny Auction Site. Nickelbids has a public support/ticketing system that provides a lot more transparency than most penny auction sites.

Bidaroo is a small Highest Unique Bid Auction headquartered in Indiana, USA.  Bidaroo donates 25% of proceeds to various charities.

BidMyDreams is a new and typical plain vanilla Penny Auction site.  At the time of our review, we didn't see any live auctions, so they may just have been taking a Friday afternoon siesta, or they've gone the way of the dodo bird, like so many other penny auction sites.

Auctions4aCause is a United States based Highest Unique Bid auction.  According to Auctions4aCause, charities of your choice receive at least 25% of the net proceeds from auctions.

Redbread is a small penny auction site for United Kingdom residents.  Redbread bills iteslf as "The People's Favorite UK Auction Site."

Bidz is a very large discount auction, selling mostly jewelry and watches at significant discounts.  Bidz is not a penny auction, however, it is very popular with consumers looking for big discounts on large ticket items, similar to penny auctions.

Winnit is a Lowest Unique Bid penny auction based in the United States.  Winnit is currently best known for hiring Nick Lachey to act as their spokesperson.

Bidso is a small United States based View Price or Reveal Price auction.  Bidso allows you to earn bids by filling out various offers from their partners, similar to the offer wall in a lot of Facebook games like Mafia Wars.

Bid4Vouchers is a United Kingdom based penny auction site exclusively offering gift cards / vouchers for auction.  Bid4Vouchers accepts bids online as well as from your mobile.

Flutteroo is a small auction site for United Kingdom residents only.  Flutteroo features 3 types of auctions, Penny Auctions, Lowest Unique Bid auctions and View Price Auctions.

MadBid is a popular United Kingdom based penny auction site that has gotten quite a bit of press lately. MadBid allows you to bid using your mobile phone, which is unique among penny auction sites.

Snaglo is a medium sized penny auction site based in the United States. Snaglo offers 10 free bids to new users when they make their first bid pack purchase.

Famdabidosy Auctions is a small United States based Penny Auction site. Famdabidosy Auctions offers 10% cash back for friend referrals and hosts Set Price, Totally Free and Night Auctions.

BidHere is an Australia based Penny Auction site. BidHere offers a wide variety of auction features, such as Cash Back, Speed and $0 auctions.

Winners24 is a small, United States based Penny Auction site. Winners24 offers Free Shipping on all items worldwide and activates new auctions every 30 minutes.

BidCactus is a large, United States based Penny Auction site. BidCactus auctions are open from 9 am to 5 pm Eastern Time, Monday through Friday. BidCactus offers specials such as Wacky Wednesdays and Happy hour Fridays.

BidRivals is a global Penny Auction site, with dedicated sites in over 20 countries. BidRivals has a wide assortment of auction items, offering many features, such as Buy It Now and Use Lost Bids.

Swoopo is one of the best known Penny Auction sites. Started in Germany in 2005, Swoopo has expanded worldwide to the United States as well as South Korea. Swoopo has a very large selection of items and features attracting a large number of users from all around the world. Enter promotion code fb0374 to get 3 free bids at registration.

GoBid is a popular Penny Auction site open to Unites States bidders only. Their auctions are open daily from 6 am to 10 pm Pacific Time. GoBid auctions offer some of the more exciting Penny Auction features, such as Trade Items for Bids, as well as regular promotions to get Free Bids.