OK, we had some snowflake decorations that died, and they had stakes on them that were about 10 inches long, and had a cross section like a + sign. The top was notched in a little smaller, like from 1/2" to 3/8 " . the other end was pointy to go in the ground.
I started with some Garage Sale deeks, and cut off the keel and then opened about a 3" hole in the botom, just forward of center about an inch.... I then stuck the stake up to the back of the decoy and holding the stake, moved the decoy around until it ballanced flat. This took a bit, and I had to drill twice on one deek, so start with your worst... :) .
I then marked and drilled a hold in the top of the deek. Mine came out right about 2" behind the neck int he center of the back. I wollowed the hold JUST a TINY BIT, so the deek can wobble a lil in the wind. There you have it, a field deek for about $the cost of a deek. You could use about anything for the stake. I was thinking a metal tent stake (look like big nails) with the head ground off and a washer tack welded on about 1/2" down for the decoy to rest on.) would work too. The ones I had were just there and worked so why not. Will be able to make about 10 of them.... sure better than $150+ a dozen.