I have a huge box of bulbs from
https://www.rosecottageplants.co.uk/ that will be going in this weekend. I'm boring and focused on edible bulbs, so mine are all tulips and camassia, but they seem to have a nice diverse selection. I found them through a
permie blog some time ago who was personal friends with them IIRC. They are very nice and professional, and I'm sad that I won't be able to order from them again after this year because of Brexit.
ETA have you thought about alliums?
--They come in every shape and size, some quite striking
--Some will spread quite nicely
--Slugs will only eat them as a last resort
--Pollinators love them
and of
course they're edible.