There is no "retail for that", retail is retail, Apple don't sell "OS X for PCs". If they did you wouldn't be posting here because this forum wouldn't exist.
You use a Snow Leopard retail DVD or Lion installer bought from the app store and restored to USB flash drive or hard drive partition, along with the Chameleon boot loader and whatever patches you need for OS X to install and run on your PC. If you don't have access to a Mac or working Hackintosh, you can start with a distro/hacked DVD and use that as base for installing retail OS X.
Anyway all of this is off topic for this forum, we don't do general OS X-installation-on-PCs-support here.
When you get to a point during installation where you have a problem with the Chameleon boot loader we can help you. As for the rest - such as which files you need, how to do all this without access to a Mac or working Hackintosh, how to restore the Lion installer to a flash drive - you'll have to look for help on that elsewhere. InsanelyMac is a good place to look for more information.