I have an existing penny auction site.
You have to add a module so users can buy an auction when they do not win it.
Price of product minus the bids the user placed.
For more details ask me.
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Online web Designing & Web Development Expert in AJAX ,PHP/MySql,Codeignitor,Cake php, ASP.NET,dot net framework more than 12 years working experience along with online promotion and Search Engine optimization