Does anyone know where I can buy a dish cover that has a switch on the right and an outlet on the left? I’ve looked all over town.

You might not get an outlet on the tray, but you do get a device that uses electricity for heating.
You can place your dish or warming cover on top of this tray to keep food warm.
💡 Tips for choosing one:

✔ Look for trays with easy-to-reach switches or indicator lights.
✔ Choose one with built-in thermostats if you want variable warming.
✔ Use separately powered outlets or power strips nearby for additional plug-in needs.

✅ B. Install a Kitchen Wall Plate With a Switch and Outlet
If what you really mean is a connection point in your kitchen wall where:Groceries

A switch toggles power, and
An outlet feeds power for devices,
…then this is easily done with a combination wall plate.

Examples include:

1-switch + 1-GFCI (ground-fault circuit interrupter) outlet cover.
Custom decorative switch and outlet combination plates (many handmade options exist).
⚠️ NOTE: This requires electrical installation work and must be done by a qualified electrician following code.