Rosy's affiliate link to the Genus Gardenwear RHS collection: ttps://tidd.ly/4afXoWt
(they do deliver to US)

Plant list & zone information:
Anemones 10-4
Fritillaria meleagris 8-3
Narcissus pseudonarcissus 10-5
Anthriscus sylvestris 7-3
Bergenia 'Bressingham White' 9-3
Viburnum tinus 9-7
Pyracantha 9-6
Euonymus (unsure on the exact variety, potentially Euonymus europaeus) 8-4
Tellima grandiflora Rubra Group 8-3
Skimmia × confusa 'Kew Green' 9-7
Euphorbia characias subsp. wulfenii 9-7