Looking for triple 3-way switch
You won't find one, because of box fill limits. By code, you are only allowed to stuff so many wires and devices (switches) in a box. Otherwise you risk overheating and a fire.


The largest available single gang box you can get is 22 cubic inches.
A one gang double 3-way switch plus the required wiring is 22 cubic inches.
A one gang 3-way plus 2 singles switch, plus the required wiring, is also 22 cubic inches.
The switch you are seeking (a one gang triple 3-way) plus the required wiring equates to a wire fill of at least 28 cubic inches. Too big for the largest single gang box.


An alternative would be a two-gang box with a mud ring that brings the opening down to a single gang opening. But if you have room to do that, then you have room to put in two switches in a double-gang opening.

Therefore, the almost non-existent code-compliant use case of a one gang triple 3-way switch doesn't justify the existence of the product.

Sorry!



Additional bad news:

Depending on whether the 4-way circuit originates in this box or passes through, I don't think you can fit all the required wires in a single gang box anyway.