Magento auction module

Hello, We are looking for an auction module for Magento. Type of auction is : "lowest unique bid wins". Rules are these one: 1. a user can place as many bids as he wants 2. the incrememt between two bids is one penny 3. a user can place bids on a range of price (for instance : 50 bids between 1,00 $ and 1,49 $) 4. 1 bid cost some credits (1 to 99) No designing is required ; we only ask you to develop the functionality. No need to develop anything in "member account" (we will do it : user will able to see all his bids). In the back-office, we need to be able to see who won the product and to set for each product : end of the bid + cost of one bid. Expert in Magento is required for this job. We need somebody knowing very well Zend and who already created Magento modules. Please give references. Thanks for your bids !