it is not common to find a bread slicer built directly into a toaster. Toaster appliances are designed to toast sliced bread, but they do not typically include a bread slicer function within the toaster itself.
Bread slicers are separate devices used to slice bread evenly and uniformly. They can be either manual or electric and are commonly found in commercial bakeries or large-scale food establishments. Some electric bread slicers designed for home use can also be found on the market, but they are separate appliances from toasters.
If you're looking for a convenient way to slice bread evenly at home, you may consider purchasing a separate bread slicer or use a traditional knife to slice your bread. Always exercise caution and follow safety guidelines when using any kitchen appliance or utensil. As technology advances, it's possible that new innovations may bring about toaster designs with integrated bread slicers, but I don't have information on developments.