Bidding directories is a well known concept and it’s pretty new (not more then 1, 5 years old). The difference between the bid directories and the simple ones is that these list the sites in a descending order of bid value while other ones list by pagerank, traffic etc.
BidForTop.com is an old, established bidding directory.The minimal bid on the site is set at only 4.00$ and on the homepage there are displayed the top 6 top bids. All the links are permanent and the bid directory aims to stay in the market for quite a while 
Same as simple directories, bid directories list their links by categories (shopping, business etc.) or by letters (a, b, c etc.). Our directory lists it by categories.
So what are you waiting for? Submit link now!