Open Source Auction Software

[jterhune]

I'm looking into setting up an auction site on my university's intranet, and have been looking for open source solutions.
I've looked at phpauction which looks good, but isn't beer free which my budget demands. I might try the free fork from sourceforge, however. I've also looked at EverAuction as a possibility.
Sadly, none of these are in portage so before I go about trying them out, I thought I'd ask for input. Does anyone have experience with any such pieces of software? Any advice? Help is greatly appreciated. Thanks.