They seem to be less often available than other iris, I don't know why, as they are lovely and easy to grow. I inherited mine from my ma-in-law. Peter Nyssen sometimes have them, but I think not this year, maybe because of the heat and dry weather. Mine were not as good as usual, only the ones in a shadier position did well. I may have lost a tray of seedlings because I could not water enough. There are usually a few new ones popping up in the border though and I am hoping for better times next year.
Farmer Gracy has a large selection of Iris although not latifolia. There is free shipping which ends tonight and a £5 discount note appears on the screen. I can recommend them for their bulbs as I have recently bought tulip bulbs from them and also in the past.
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https://www.jparkers.co.uk/iris-latifolia-collection/
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.