Home Depot Roof Junction Box for Panels

What's the cost of this box? I assume the strain relief's are separate purchase as well?
I was looking at some boxes on the solar sites like this one;
http://www.altestore.com/store/Enclosures-Electrical-Safety/Electrical-Enclosures/Combiner-Pass-Through-Boxes/Soladeck-DC-Combiner-Box-6-Din-Rail/p9517/

I've used one and it works perfectly.

The grey plastic junction box I used was 4x4x2" with no holes in it. The top was sealed with 4 screws and a rubber gasket. It had 4 tabs along the outside to screw it to the roof.

I cut a hole in the roof and in the bottom of the box to match and used lots of 3M 4200 and SS screws to attach it.

The wires enter the box through two strain relief fittings, compression type with rubber O-rings. I think they were for cable TV wiring. The solar panel wires fit perfectly.

Thanks, I found one, looks perdy good.

Any J-Box should work as long as you get the correct strain reliefs.

This post mentions HD boxes.

Electric GRAY box.