Over the next few weeks i am having an auction plugin made. It will be similar to this..
The actual auction listings will be under their own tab and not mixed in with the normal classipress ads. It will also use your own already created categories so you won't have to re-do all of them, which for some will save hrs...
This plugin will be avaliable to buy if you guys wish and will be updated to be kept in-line with classipress updates etc..
I think it will be around £99.
Let me know if you are interested.