Auction related extensions, plugins, templates, scripts, etc.?

I am planning on using EE to build an auction site for users to sell and bid on some digital goods. I haven’t been able to find any ready made extensions, plugins, templates, scripts, etc. that I could integrate with EE.

There’s a product for Wordpress called WP Auction which is kind of close to what i am after, but I am sold on using EE.

Any suggestions? Thanks!