Is there a way to indicate a specific attribute is soldout without having to delete it?

If not, where is the edit that displays when a given attribute is flagged as readonly? I will just change this edit to indicate that specific one is sold out instead of the default message "Please correct the following: On the Option for: Size You picked an Invalid Selection: 1 pound"

To make sure there is no confusion.....

Product A has 3 attributes. For this example, lets say Small, Med and Large. I want to indicate that only the Large is sold out, but want to be able to continue selling the Small and Med sizes.

Thanks!