($26) has gained so much attention due to how comfortable it wears. It literally feels like air, but a breeze of air that deposits a wash of color, giving a soft blurred-out effortless look.
The formula of the air matte liquid lipstick, albeit being amazing, is not unique to NARS. You've got more affordable options.
($12). It has the same mouse texture that glides onto the lips like a dream. The color is more buildable than air matte, which means you can choose between a soft-diffused look or a more opaque look. The formula won't dry down your lips. Even better, it's more transfer-proof compared to the air matte.
Another dupe option is from the Korean beauty brand - Etude House. Per its name, the Etude House
($14) is the most long-lasting option, although not completely mask-proof. This tint has a watery texture that dries down quickly to give a similar soft matte finish, but the color is more opaque. If you have extremely dry lips, you might want to avoid this one or layer it with a lip balm underneath.