I make my own ---
Do It Yourself - Dirt Sifter
When caught in a pinch and needing a sifter and not wanting to purchase one through one of the trap supply houses. You can build your own.
All you need is an old 6 to 8 inch sauce pan. I usually get mine at garage sales, that part of the tip may keep you from sleeping with the puppies. Take a piece of 1/4 inch hail screen and place on the bottom of the pan. Mark every other hole until you have approximately two-third of the bottom of the pan marked. Then take a one-quarter inch drill bit and electric drill, drilling from the pattern you made, drill out each mark. Making sure to leave adequate space between each hole. I like to make the last 4 or 5 center holes a little larger, but that is a personal preference.
A colander pan works much better because the holes are already there, all you have to do is take a 1/4 inch drill bit and make them larger.
The reason I like this type of sifter is it gives your room for rocks and grass when making a set. The handle on the pan also makes it easier to use in tight spots.
You can also use a coffee can and a nail to make the holes, if in a pinch, if you can't find a sauce pan...