Best one I ever had was made from a circular saw blade, if you have any interest in DIY. I made mine in the pattern that allows your fingers to go thru a cutout under the handle, for less fatigue. I finish ground mine to a single bevel like the ones in NW AK. In practical use, a radius cutting board or heavy wooden bowl is almost as important as the tool itself. There are a bazillion ulus on ebay, but I think you can make a better one.
