Found a great sight after Mari (fan of Andy) contacted me and asked if there was a mailing address where fans could send Andy letters or 'Get Well/Best Wishes' cards. Below is a website which from my understanding, the messages will be printed out and then taken to him.
Also there is a physical address that I came across. Unfortunately I cannot vouch for the address being legit or whether it is current. Let me know if someone has tried and received positive feedback.
Send Your Support Message to Andy Whitfield
As we have all read, Andy Whitfield has been stricken once again with cancer resulting in needing treatment and bowing out of Season 2 of Spartacus.
This page has been set up to provide a way for fans to leave their support to Andy.
Lesley-Ann Brandt (Naevia) will be taking these messages with her when she goes to see Andy and his family in a week’s time. I’m quite sure Andy knows how much the fans love him but your words of encouragement will help him through the difficult times ahead.
UPDATE 26 September 2010
Thank you to everyone who submitted their message to Andy. The comment section has been closed. These messages will be a way for Andy to know how much the fans love him. He IS Spartacus but more importantly he is Andy Whitfield, husband, father, son, friend, actor.
All these messages will be given to Lesley-Ann Brandt who will take them with her when she sees Andy in the coming week.
Thank you everyone for your support.
If you would like to donate to the Leukemia & Lymphoma Society in Andy Whitfield’s name please use one of these links: Australia | USA | Google other countries – Help them find a cure.