Possible Duplicate:Which Ecommerce Script Should I Use? I'm working on a website that will be selling tickets and they will go fast. I need a server side solutions, in php if possible, that will keep tickets from over selling. Any suggestions?Also, I'm looking for the system to be more plug and play, like an API maybe. I'm not really looking for a eCommerce solution to sell goods. I need something simple and can sell tickets.Like EventBright but for a server in php. 
Looking for a good server side shopping cart solution
php;shopping cart
OSCommerce is free and it uses PHP.  I am not sure if it tracks inventory but it should.  Since it is open source you can easily mod it.  It does allow for easy purchase integration as well.  The big downside is that it is older and bulky.