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If I was going to suggest one handle material to a new maker working on getting his knives up to snuff, I would suggest buying a 2-3 foot board of nice cocobolo and cutting the whole board into handle blocks. The blocks can be split into scales as needed. Cocobolo looks good, works easily, needs no finish or stabilizing, and is a popular wood. Woodcraft sells it by the board reasonably, as do many ebay sellers. A 6" X 36" board will make about 20 handles.
For me the best bang for the buck is scraps. I use cut offs and pieces left from previous projects, and they come together as new combinations. Waste not, want not... and it gives me a chance to exercise some creativity.
I'd agree with Bladsmith. If Cocobolo proves thought to work with there is Zircote and Bocote each having some of the same characteristics of Cocobolo without the itches.