There was somthing posted about egg white's the other week somthing alond the lines of they don't make it anymore but you can buy it from some web site. If I find it for you I will post the link to let you know.
The frozen egg whites mentioned in the other thread are usually found in the frozen section in between the vegies and the pastries. Well, I guess all supermarkets may be different but thats where it was in mine. It was a blue carton. I have also heard of powdered egg whites but have no idea who sells them.
Hope that helps