Barking!
Check with
www.rctank.de, at [link=http://www.rctank.de/product_info.php?cPath=21_104&products_id=1257]THIS link...[/link], as they still have their T55's on sale.
Thats where I got mine, but if ya do, ask 'em to open her up, and re-bag the track links and track pins, otherwise they'll end up ALL over the box...
Hope that helps ya out!