If it's just a matter of finding a copy, here are some links. I am not sure what amount currently goes to fund the SOWF. The Warrior Mentor website has been down for at least the last two years. Congrats to your son!
http://www.amazon.com/Get-Selected-S...s=Get+selected
http://m.ebay.com/itm/Get-Selected-f...625?nav=SEARCH
http://www.abebooks.com/Get-Selected...0975355275USED