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Thomas,Brazed carbide tipped blades, or indexable carbide tips? Do you need the blade/bit holder also, or just the carbide blade/inserts?
Double checked, littlemachineshop.com carries cutoff blades and indexable cutoff tools and holders sized for 3/8 and 1/2 toolposts. I don't know what carbide is on the brazed blade, it doesn't specify. I'd assume you could find whatever carbide tips you want for the indexable cutter blades. LMS carries C6 and C2 carbides to fit their indexable holder blade.
Here is supplier I use the micro grain carbide.McMaster-Carr
Part off blade here are the style I use.Part off blades