I have a three switch panel to control three separate lights. I would like
to have one of the switches replaced with a 'timer' switch to allow me to
turn on outside lights and keep them on for a set time. I have not been
able to find a switch like this in my local store ... do they make them, and
any suggestions on namebrands or stores where I can get one? And I assume
a DIY changeout.

Thanks in advance.