Back in the day when I worked on my own cars, I seriously looked into getting a gas welding set as it seemed the most versatile choice, particularly the additional uses like heating up stuck bolts, maybe heat treatment or even heating stuff for improvised blacksmithing. In the end I didn't go for it as the bottle hire made it unviable for the amount I'd use it.
Decades later it might have made more economic sense as I'd started diving so would have a secondary use for the oxygen. A diving pal said his Mrs, who had a welding set for art projects, couldn't understand why the oxygen seemed to be going down so quickly then realised he'd been pinching it to fill his dive bottles. Strictly you should use "diving grade" which has more QA traceability, but hey ho.
Anyhow, I never got a set. Don't know how the bottles are charged these days and whether you can buy rather than rent - somehow I doubt it as I think you just swap for a full one rather than get your own bottle filled up as you would with diving cylinders. At least with TIG you only need one bottle of argon for most things
