Here is a mod that allows many captured people to be put into and taken from stasis pods.
The cost of selling pods with people is the cost of the pod plus the cost of selling said person. The research for opening the pods is the same as for the pods themselves.
The cost of putting people into pods is 5000 plus 2 medical supplies. The research required is the person researched, medical supplies, cryo prison, and the pods. The action requires medical facilities.