You need a Really strong flashlight, and full dark to see much of anything in a Maran or dark green egg. I have a small tactical flashlight that works pretty well. I have to be careful about how long I keep it on the eggs cause it gets Hot.I've got 3 green 1's going and I can't see ANYTHING but shadows.
When I went to the feed store they were sold out in about 7 minutes, I think it was about 25 chicks. 4 went with me.