tadem breakers for Siemens type QP
 

I need to add temporary circuits to a Siemens panel that takes type QP breakers. I cannot find anyone who carries Seimens type QP 20 amp tandem breakers

Call the electrical supply houses in your area that rep Siemens. Siemens is carried by both box stores. Home depot and Lowes. At least they do in my neck of the woods.