What all companies make stacking headers, like the kind found on the MKR series of Arduinos?
I'm trying to turn out some stackable shield-type gizmos to pop on top of an Arduino, and finding this one part has been more frustrating than all the rest put together.
Ideally, I'd love the Manufacturer's Part Number for a few different options; enough options that I could put one into http://www.hqew.com/ and find it in stock somewhere in the Hua Qiang Bei area. Stacking headers have been strangely difficult to find here!