Where to find corrugated cardboard boxes with window?

I need help. I haven't had any luck on where to find corrugated cardboard boxes with a window (or kraft cardboard) . I need my product to be in a eco friendly looking packaging and the box to have a window, so consumers can see what it's inside. Does anyone knows about a supplier that has these? I am in San Francisco, so it will be a plus to find it in the city. If not, online is also great.

Thanks for your help!