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A friend with a macadamia nut grove speaks highly of the crack-a-mac. They get theirs in bulk direct from Australia, but the product is also available on e-bay and Amazon from what I have seen. It works well from the demonstrations I have seen and produces mostly whole nuts.
https://www.photomagnets.com/best-black-walnut-nutcracker.htmlThey have some interesting products and are a family owned green company.
http://www.tjsnutcrackers.com/ ive got one of these. picked it up locally in captain cook here on big island hawaii. very effortless, but only can crack one at a time. perfect for home use. i want to say it was like $90 USD about 5 years ago