Small Engine Troubleshooting Problems? Ask a Mechanic Now.
No they do not.
I would search for a local gas supply house.
If you plan on filling a room with oxygen I would suggest you check with your local municipality, I am sure they will require you have safety measures in place. I would be glad to help you locate a gas supply company if you provide me with your location.
You will have to become licensed to deal with that quantity of gas. Honestly its extremely dangerous. I will opt out to allow another expert to better assist you.