This usually happens when too many people visit a site too quickly and begin to request the items at too fast of a rate than they expected.
Either their server is down (which is highly unlikely seeing as how the main page comes up fine) OR they simply just removed the page to block any further attempts for requesting a free football/soccerball.
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request. Please contact the server administrator,
[email protected] and inform them of the time the error occurred, and anything you might have done that may have caused the error. More information about this error may be available in the server error log. Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request. Apache/1.3.37 Server at webfootie.com Port 80