I've used the Pek Preservino system for years. Their argon comes in the same little cartridges as N2O or CO2 for siphons. In fact, I just started using N2O since it works well enough for just a couple days.
Looked it up. $12 for 4 cartridges, or $80 for 30 cartridges. That's pretty humane.
But given that Coravin has a separate page for their board of directors, each with a full bio and a mugshot, I think it's safe to assume that their cartridges are non-standard.
