Yeah, that’s just how it be these days. The damn thing comes cheap, but surprise, surprise, they charge ya for it l8ter. Like, the fan was cheap af. Unmatched by the competition. Almost free, for that price. But the cartridges? Those damn things will get me broke. If I knew ahead of time it would only work with their proprietary air, I would have looked for another option. Costs more upfront, but you end up saving overall