I have been wondering about a tooth bar and decided to build one to see if they are worth while.
I used 1/4" X 1.5" for the bar, 1.5" angle for attaching and a 1/8" X 1.5" leading edge, 1/4" X 1.5" X 3" for the teeth and some 1" square heavy wall tubing for the shanks.
All the metal was left over from another project, so I will have to guess the cost, A 20 foot piece of steel strap is only a small amount higher than a 10 foot piece which is why I have left overs. I am sure the cost would be under $20.
The result works fine, Very worth while tool, not as nice looking as some but convinced me of the value of a tooth bar.