Building your own prop replicas from Lost in Space has become more and more popular over the years especially since the real props are so expensive and rare these days. Although you would think fans would be limited to building laser replicas and other less sophisticated props, it is not true. The focus of amateur prop builders in the past few years seems to be on full size robot replicas. These replicas can cost anywhere from $5,000 to $35,000 and vary in detail depending on the abilities and resources made available to the builder. A project like this can take months if not years to complete. There is talk that a company such as Sharper Image might be actually mass producing fully built robot replicas in the near future but a task such as this would make such a replica still cost between $5,000 and $10,000.