Phil Nitschke of Exit International made several videos of how to set up disposable party balloon helium tanks, construct a flow metering fitting using the tools they loaned their members through local Exit chapters in Australia, etc., but IMO that information is outdated since those helium tanks are now mixed with air. If you are interested just out of curiosity, they are in the Resource Compilation thread in the file BedsideViewing.rar in the downloads section.
The good news is setting up the rig using inert gas welding equipment is so easy that a video isn't needed. In the USA, just purchase a filled cylinder of inert gas, 20 or 40 cf, online, for instance from the site abbreviated WS. Then purchase an inert gas welding flowmeter regulator for that particular gas, which will screw directly into the gas cylinder. If the flowmeter regulator doesn't come with a barb fitting to attach 1/4" plastic tubing to the outlet, an adapter that will screw into the outlet can be purchased online for under $10. Then add elastic to the oven bag as in the Betty/Chi videos and it's done.