Where can you get a double barrel bolt action rifle that I saw on Youtube?

Double barrel bolt action rifles exist but are quite uncommon and are typically custom-built by specialized gunsmiths. They are not commonly found in the mainstream firearm market.

If you are interested in obtaining such a rifle, I recommend contacting a reputable and experienced custom gunsmith who specializes in building unique firearms. They will be able to guide you through the process of designing and creating the rifle that meets your specific requirements.