I found them at Michaels, Joanns and other chain stores. Look where they sell the little bottles of acryric paints, like Apple Barrel.
They are on a card, 3 metal tips and 2 plastic ones for less than $5. They will fit on all sizes of Elmer's glue bottles that I have tried so far :D:D:D
To clean the metal tip, I use a pin first and then soak them for a few minutes in boiling hot water. Then a toothpick to take out the bigger pieces of glue, and then run it under hot water. It only takes a few minutes :wink: