I checked one of the best general catalogs that I know of and the smallest they showed was a 1MT. If you can’t get any direction on finding a source, I think that your approach may have to be to find the names of dead center manufacturers by visiting your local tool distributor and either start checking the manufacturers individual catalogs there or the manufacturer’s web sites.
FWIW, there are really only a few companies that print catalogs and they sell them to small distributors with the distributors covers on them. Riten, Collis Tool and Morse, make, supply or import dead centers. Motor Tool Mfg Co. may be able to make or supply one also. Of course, there are also companies like Small Parts that specialize in equipment for making small projects and magazines for small projects that have ads for supplies.
Henry in MI