Lovely Purple

I am trying to look for these Allium Giganteum flowers which I saw on display last year with my mum but I cannot seem to find them anywhere! Now I know since I've researched on it that they are out in the winter -early spring time only. But then, although we are nearly just one month and a bit away from summer, it is still cold! So I am still hoping to find one somewhere..... On a hunt for it!