This is my swiss army knife hub/card reader that I carry in my backpack.
If you're in the US, and have a "Big Lots" nearby they sell them for 10$.
The reason I endorse these over other hubs is the fact that this one accepts 5v power to allow connecting power-hungry devices in a pinch. If you plug it directly into the Pandora's host port and lean the screen against it it holds it at a good angle for "desktop" viewing as well.