rhubarb plant (half a crown) (Knighton)

I love rhubarb, but often it's not available. I'd like to grow some myself. I grew it in the past, my father cut the crown of his large rhubarb plant in half and gave me one of the crown halves that I planted at my previous property. When I moved to my current house, I cut that one in half and planted half in my garden; sadly, that one didn't survive. If anyone has a large plant they wish to separate into two, or one they don't want, I'd love to have it. Thanks.