Try this site - they seem to have solid plastic ones and the cage type.

Professional Dog Muzzles only £4.99

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Bergies and borders - what more could anyone want? Siamese and maine coons, of course!

From the Rubaiyat of Omar Khayyam:
The Moving Finger writes, and, having writ,
Moves on, nor all thy Piety nor Wit
Shall lure it back to cancel half a Line,
Nor all thy Tears wash out a Word of it.
(But you can always edit your post, of course )