Although there are dedicated mono cartridges out there for 78s, many cartridges have the 3 mil stylus available. Pfanstiehl tends to use "D3" to indicate a 3 mil stylus, and "D7" for a 0.7 mil stylus for their aftermarket styli.

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The cheapest option is to get an Audio-Technica AT-3600 or a Numark Groovetool (MG09D), while the popular AT95e also has an aftermarket 3 mil stylus available.

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Vintage cartridges such as the Pickering V-15/Stanton 500, Pickering XV-15/Stanton 681, Shure M75 (and variants) tend to have aftermarket 78rpm styli available.

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If going for the existing cartridge route, do remember to hit the mono switch on your receiver, or you can simply use a Y adapter to bridge the left and right channels together from the phono preamp's output.