I think that we should look at this in a professional way.
The woman obviously has a need that she is attempting to meet, and a right to do so. We must respect this.
The item can be ordered via the net, or someone could volunteer to go buy it. I agree that no staff member should be made to go buy one. I would likely have a problem buying this myself.
The resident should be assisted in keeping this "item" clean and stored in a way to protect the residents privacy.
I did read in one reply that family should go buy this. If this is possible, sure why not. However, the resident may not have family. And even more important, the resident may not want the family to know about this. So we as professional caretakers should step up and assist the resident in this matter. After all this is part of Maslows hierarchy.