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.

BuyLow Auctions is a USA based penny auction site, where if the winning bid is over $20, they cover the difference to ensure that no item is sold for over $20.  BuyLow Auctions offers a 3 day trial of 10 bids for $4.95 to get started, and monthly discounted bid purchases thereafter.

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.

Haggle is a large, United States based Penny Auction site open to United States bidders only. Haggle auctions vary in two ways: by the price increments and the time added to the clock.  

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.

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.