Get a 4x4 ft sheet of plywood - for the roof.
Some grey cement blocks - enough to form the perimiter walls, leave one block out to make the opening.
Some sand to fill the center -- packed full.

If it is outside, it should be in a sunny location.
The sand must be damp.

If you want to get fancier, buy some 1"x4" pine to make a frame inside of the cement block walls and screw it into the roof. This will keep the light out and help the sand stay damp as any ventilation will dry it out.

If you want to do more, screw a heat pad onto the roof, and buy a cheap themostat to keep it at 86 degrees. If you do this and the roof is well insulated from exterior heat,most igs will lay directly below the pad, and it makes for easy excavating of the eggs. One year the pad got unplugged and a female layed 3 ft down in hard black clay-- It took hours to excavate what should have taken minutes.

Good luck

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