you can get a hovabator from LLL reptile. Don't get the one with the fan, as you don't want moving air. The normal model does have some moving air, but you minimize it by putting the eggs in deli cups of soil/vermiculite/whatever with lids on them and small holes in the cups for slight air. It is cheap, it takes about a week of running it and constantly checking temp every 15 mins to get it set perfectly (and setting it for one spot might change if you move it to another location, I have found).
Anyway, once it's set up, get a deli cup 1/2 full of moist vermiculite, get a stiff paintbrush, plastic spoon, and pencil with soft led or fine felt tip marker.
Go to the spot and start brushing away the dirt. Carefully brush it out of the way as much as you can. Then I use the spoon to score the top of the earth and brush more away. I repeat until I find a nest. I do this slowly and meticulously so as not to harm an egg.
When you come to the first egg, uncover the top of it, and enough of it that you can see the top. Note the positioning. The important thing is that the top point stays at the top. Use the pencil or felt tip to mark this spot carefully. Now make a depression with your thumb in the material in the deli cup that will accomodate this egg in the same orientation. Gently remove enough dirt to carefully and slowly lift out the egg and set it in the deli cup in it's new depression. pack a little extra material around it so only the very top (showing the mark you made) is visible.
repeat until all eggs are out of nest.