My Craig’s list search worked! I got two replies and one of them panned out. The folks were thrilled to get rid of plants that they had no use for and to not end up with big holes where they were.
I got three overgrown plants that were too far gone to try to transplant. I did it anyway. For the cost of three bags of soil, which was less than one of the many nursery pots of rhubarb I bought, I got three huge plants.
I brought them home split them and planted them. Now we can cross our fingers, treat them well, and hope that few of my new splits make a go of it. Next year at this time I will have at least a couple new plants, if I am lucky more than that.