Q: where can i download lion server?

From the Mac App Store http://itunes.apple.com/us/app/os-x-server/id537441259?ls=1&mt=12

However, you really don't need OSX Server as the regular version of OSX includes everything that OSX Server has. It's just that Server gives you a nice GUI while regular OSX requires Terminal work. If you're going to be a power server user, then you might as well learn Terminal commands.

Now that Mountain Lion is out, you can't buy older versions of OSX directly from the Apple Store. However, you can try calling Apple (1-800-MY-APPLE) and tell them that your hardware doesn't support Mountain Lion. I'm sure they still have copies of Lion. It's not like they destroy all traces of previous versions of OSX every time a new version is released.

I can confirm...calling in did the trick. Apparently I'll receive a download code within 1-3 days. Thanks for the tip!