I’ve got plenty and would be happy to dig some up and send them to you. But it’s better to do it in the fall. Sun chokes use the energy they store in the tubers to push through the soil and grow rapidly in the spring. After flowering, the process reverses and the plant starts storing energy in tubers so it can survive the winter and grow rapidly in the spring. Right now they are pretty depleted and I think you’ll have better success with tubers harvested in the fall.

BTW, if they ever start to take over an area, just keep mowing them down every few days and they’ll eventually run out of energy and die.