Yes, they were taken down because they were not compatible with this board.
I have my eyes on a commercial classifieds script, but I still need to look at ir carefully. It includes auctions and alot of nice features, but it would be a major overhaul of our sales section. The donations have made it possible to buy the license is necessary (for it or other software), so I may be looking into it in future. I'd love to have them on the site.