Is there any push-button off-on switch?
That switch is in the catalog section "All Products > Electromechanical > Switches > Tactile Switches > Mountain Switch 101-0464-EV". Tactile switches are usually designed for keyboard entry with a tactile click or snap action to give touch feedback that they have changed status. Early calculators didn't have tactile switches and were very prone to data entry errors with missing or double-keystrokes.



An image search for tactile+latching+switch throws up plenty of results. In general they seem a bit taller than the momentary action type but this is to be expected as the latching mechanism has to be incorporated.

As always heed the EE.SE site advice: "no datasheet - no sale".