153481 Auction integrated /vBulletin

Basically, we would like to integrate the Top Auction stand-alone software into vBulletin 3.6.7, so that it's a part of the forum. If that exact thing is not possible, we need an auction system as much like that of Top Auction as possible to integrate with our forum. NO PayPal, credit card, shopping carts...no other links or items such as these necessary. This is for a very small forum, less than 100 members, and would actually be used by just a few of these members. None of the "freeware" quite comes up to standards (vbay, etc...). Please ask if any further info is needed. Thank you very much.