Do the home despots have flush nippers? Don't think I have ever seen that. You can however take a set of normal nippers with a double bevel and grind the top off until you reach a single bevel at the cutting edge. Be careful not to over heat and loose the temper. Also make sure to grind a crown in the top so the cutters can be flush and don't take more off one side than the other. The blades want to meet evenly across the entire length. Either that or just buy the nippers from LMI
The point of selling pre tapered finger boards is getting paid for pre tapered finger boards.

They don't know or care if you have a proper jig for cutting the kerfs and perhaps you are building a fretless. Well, maybe they do care if you don't have a proper jig. Then maybe they can sell you one! The slotting or kerfing service is not expensive at all so maybe you might want to consider it the next time you purchase a fret board and don't have the proper set up for cutting your own.
Greg N