aj classifieds is very good. Other scripts you can check out can be found in http:// opensourcecms.com. Craigslist is custom in-house made so an exact same type can be hard to find
I am sure there are a lot of crappy scripts out there....It would be typical for a company that wants to stay in business to charge $300 for a single domain, but I would never buy anything from them again...sometime back I bought a script from them - It was crap, and buggy, and once I asked for a refund, their attitude changed to not giving a refund, and I had to get the refund the hard way, and it took about 2-3 months to get my money back.... They sure want to sell to you, but if something goes wrong, dont think they will be refund friendly.... AJ is not refund friendly at all.... I do not know anything about AJ Classifieds... however, last I heard, their classifieds was $1000 I just did a quick read up on their prices, just so you know, for $299, you get no upgrades, and their code is encrypted for that version. with that alone, I would certainly pass. The enterprise is $2499.
open-classifieds.com/--- how about these guys? anybody got any dirt on them? They claim there are 16500 websites with their free software running