He had a few at the time, brand spankin' new. Can't hurt to email an inquiry.
WOW, $540 on Amazon: http://www.amazon.com/GM-Part-26052428-SWITCH-HDLP/dp/B000Q8ZLXC
$300 at Rockauto: http://www.rockauto.com/dbphp/prt,301,D6237A
$284 at gmpartsdirect.com part # 26052428