How do I install a new copy of Mountain Lion or Lion?

Question

A few years ago, I bought a used Mac Pro and tied it to my Apple account that I had for my iPad. Great. It's got Lion on it.  I cannot upgrade to Mountain Lion so the Apple Store won't let me buy Mountain Lion.
I just bought a used Macbook.  I want to reinstall the OS onto a brand new SSD.  When I boot from a Lion install disk, it gets to the point where it's about to install, then says that I have to use an account that has purchased Lion.  I cannot purchase Lion since it's not available and I cannot purchase Mountain Lion since my Mac Pro cannot upgrade.  I also cannot create a brand new Apple account since the new account has also not purchased yet.
How do I go about installing?  Turning off Wi-Fi makes it complain that it needs to communicate to the Apple Store so that's a no-go as well.

Answer 1

I'm in a similar bind, except complicated by the fact that I don't understand nor can I find the mysterious "Recovery HD" or "Boot Partition". 
Sorry, my bad.  I'm brand new to Lion and Intel Macs, but not to Macs.  I've been using Macs since 1986, and my most advanced Mac until recently was a PPC G5 Quad
The similarities with the OP are that I have just bought a Mac Pro 1,1 (original 2006 model, actually built in September of 2007).  It came with Lion pre-installed but no install media (flash drive), and I know that it couldn't have possibly shipped with Lion in 2007.
I have not been able to find a way to buy Lion either, and the machine cannot run Mountain Lion.
Where I am at a worst disadvantage, is that I haven't been able to wrap my mind around this mysterious "Boot Partition" and Recovery HD concepts.
I see nothing in the Finder or Disk Utility that remote resembles another volume or partition other than the boot drive.  Yet System Profiler shows me this under Serial–ATA:
Intel ESB2 AHCI:
  Vendor:    Intel
  Product:    ESB2 AHCI
  Link Speed:    3 Gigabit
  Negotiated Link Speed:    3 Gigabit
  Description:    AHCI Version 1.10 Supported
WDC WD3200AAJS-41VWA1:
  Capacity:    320.07 GB (320,072,933,376 bytes)
  Model:    WDC WD3200AAJS-41VWA1                  
  Revision:    58.01D05
  Serial Number:         WD-WCARW6359270
  Native Command Queuing:    Yes
  Queue Depth:    32
  Removable Media:    No
  Detachable Drive:    No
  BSD Name:    disk0
  Medium Type:    Rotational
  Bay Name:    Bay 1
  Partition Map Type:    GPT (GUID Partition Table)
  S.M.A.R.T. status:    Verified
  Volumes:
disk0s1:
  Capacity:    209.7 MB (209,715,200 bytes)
  BSD Name:    disk0s1
  Content:    EFI
Mac Pro HD:
  Capacity:    319.21 GB (319,213,174,784 bytes)
  Available:    293.58 GB (293,584,060,416 bytes)
  Writable:    Yes
  File System:    Journaled HFS+
  BSD Name:    disk0s2
  Mount Point:    /
  Content:    Apple_HFS
Recovery HD:
  Capacity:    650 MB (650,002,432 bytes)
  BSD Name:    disk0s3
  Content:    Apple_Boot
The text in bold maroon letters is what has me baffled.
I've Googled and conducted Forum searches for 48 hours and can't get my head around this.   
Do I have such a boot partition or Recovery Disk or not? 
If I do, how and where do I find it and access it?
If I dont, what is the System Profiler telling me under Serial-SATA?
How and where can I buy a legitimate copy of OS X Lion that I can legally install on my otherwise admirable performing G5 Quad 2.66 GHz with 13 GB of RAM?
I would be most grateful if anyone can point me in the right direction,
Thanks in advance.