They should be available now or very soon at most decent garden centers. They are big business and I can't imagine you having much difficulty finding them - as well as many other spring tubers - begonias, lilies, dahlias, etc. March for sure if not now.

I bought mine a few years ago in Wilko. They have all kinds of bulbs and tubers at the moment.

I assume you mean Ranunculus asiatica, double flowers which are a turban shape? come in a range of bright colours? the corms are available now or you can buy them in pots like primulas.
Ranunculus is a very large genus of plants.

Thanks everyone.

Barhgate- I will pop into local garden centre and have a look. Are they frost hardy?

Thorneyside- Thought it would be better to get them as plug plants now or can I plant corms now for them to flower this spring/ summer?

Seaburngirl- yes I mean the asiatica variety. I Particularly like the white and pink ones, planted up in individual terracotta pots.

No they are not frost hardy. You can pot them up in the house to give them a headstart and move them outdoors once the weather turns nice. They will bloom continuously until frost.

I have found they don't repeat flower for me but each corm can produce several flowers with a flowering season of about 6 weeks. then they die back and disappear under ground until next year [in a sheltered spot they can come again year on year. certainly killed by frost here in E Yorks.

Thank you Bathgate and Seaburngirl.

However, each bloom will last for over 2 weeks looking good. They make outstanding cut flowers too and wide palette of colors.