JT sold those with an adapter for a while, too. They're conventional off-the shelf cartridges, originally intended for things like life vest and life raft inflation, and come in sizes ranging from 16 gram up to I think 122 gram.
The problem with them is they're all fabulously expensive. Typical 12 grams enjoy an economy of scale that comes from decades of common pellet-gun use. The bigger cartridges are typically only used for things like the life rafts, and so production numbers are far, far lower. Which of course means costs are much higher.
They were popular for a time when bundled with bubble-packed box-store markers, but most people find them much too expensive for regular use- like $3 to $5 each for the smaller ones, and upwards of $10 - $15 for a 33 gram.
Long story short, yeah, they work if you've got the adapter- I've even seen guys convert some of the bike tire inflation kits to work as well. But they're kinda spendy for regular use.