It is only distributed by the Chinese KCB cell bank. So your best bet is to get it from a lab which use it. Many papers have reported getting it from Dr. J. Baselga which at the time was at the Oncology Department of Vall d'Hebron University Hospital, Barcelona, Spain but he has since moved to the US. So the best bet would be either to contact someone at the Sanger center (its is one of the cell line of their cell line projects) or from the Barcelona lab which is currently using it: