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Another site I have used.

https://www.sharpeningsupplies.com/Sharpening-Stones-C1.aspx

Diamond plates like the atoma 400 or dmc 325 are easy to use and will last a lifetime. Wet and dry can be used on a counter top or substrate like a flat glass plate or marble tile.

Both options...

The flattening stones are useless. Most use a diamond plate or wet and dry on the countertop. Try checking out the linked website. Many of us have used him and has good prices.
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What do you call unique. Most are of basic design due to functionality. Anything with a more out there design wounld need to be custom and that means $$$. You can paste some balsa wood and save that...