The bad news is, they're insanely difficult to find.
They do sell them at 7-Eleven.
The really bad news is, it took me and my unbuttoned pants two grocery stores and a drug store to figure that out.
Colby called me when I was pulling into our parking lot, and I was sure he was going to be all, "I just got home, where the heck are you?" and/or "You are a HOT MESS" and/or "How can I save you from yourself?" But instead he was just calling to tell me he was on his way home.
HA! Got away with it again.