Found this in my drafts folder, sorry, thought I had posted it. Hopefully you have sorted some suppliers for your project but if not..
I’ve bought late good season perennials in 2L pots from Farmyard Nurseries and planted them straight out in the past. They seem to have decent multiples in that size still in stock, of most things on your list.
Mountainous Northern Catalunya, Spain. Hot summers, cold winters.
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'The power of accurate observation .... is commonly called cynicism by those that have not got it.
George Bernard Shaw'