How to make them yourself...

Find the script font on MS word or other WP program that you like then print it, the size you like.
Next you cut out the words about 1/2" larger than the word.
Now use glue stick, Office Depot is fine. It is water soluable.
Glue the cut out to your favorite colour Monocoat or Trimcoat.
Taking your time and hand cut with a new #10 blade every five minutes.
When you are done cutting it out, spray water on the paper and let soak for a minute then rub the left over paper lettering off.
Stick the lettering where you want with iron or windex method.
Good luck.
Ted