Bought a couple of sets on the same idea a few years back. Have had a lot of fun throwing them with the kids.
There are a lot of generic models available. Gil Hibben and John Bailey are the names inscribed on the ones I have. Bigger/ heavier models are easier to learn the technique on, in my opinion. A flat mill file is a highly recommended addition to the set. The chinks and burrs that inevitable form on the knives will have to be immediately filed smooth lest one slices one's hand open at the throw.
A cut of three trunk makes a fine backstop, endgrain being more gentle on the blades. Conifers, like pine, spruce and fir, have in general softer wood and seem to be more readily useable for this. Or a backstop could be built from scrap lumber. Lots of ideas on this in the net.
Have fun and please report back on the subject.
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