Photoshop or CS3 for v 10.4.11 with (intel)

I'm running OSX 10.4.11 and would like to know the versions of Photoshop or CS3 that will run on this system. I'm planning on buying a used copy of Photoshop or CS3 but want to make sure I buy something compatible. I have noticed that many of the system requirements say they are compatible with V 10.3 or later but then say (not Intel) which mine is! Also, does anyone know a reliable source for purchasing "used" software. Any advice is GREATLY appreciated. Thanks!

CS3 will run just fine on that system, also CS3 is a Universal binary, meaning it will run nativelly on both PPC and Intel processors

You should easily be able to get a copy on ebay