Finally I decided to just make my own. Please feel free to use for your struggling missionaries who need a pick-me-up from home as well. Just save the bag topper/ label to your computer then resize it.
If you want the ziplock bag topper to fit on a sandwich sized (or probably snack size) bag, it needs to be 6.5" wide (the direction the font can be read) by 5" tall. You will fold it in half on the center line. (Yes, I know it is sideways right now... that is the easiest way to make a bag topper in Microsoft Word.)
And in case you just want the prescription label without the bag topper... (You could glue it on to an empty RX bottle filled with M&Ms.)