As the title says, are these available? I don't seem to see any.

 

As the title says, are these available?

Yes.

 

Yes.

Here is what I look:
http://www.microchip.com/ParamChartSearch/Chart.aspx?branchID=30048

What feature should I be looking for?

 

Here is what I look:
http://www.microchip.com/ParamChartSearch/Chart.aspx?branchID=30048

What feature should I be looking for?

It seems not to show on the parametric search.

My guess is that all parts that are 5V capable with a 3.3V core have the built in regulator. For instance:

http://ww1.microchip.com/downloads/en/DeviceDoc/PIC18F87K22-Family-Data-Sheet-30009960E.pdf