Defense Distributed is selling  30-round AR-15 magazines for $50 a pop. Not especially newsworthy, except that these magazines are 3D-printed. I have no idea if they are any good or not; they look reasonably rugged, if somewhat lacking in detail. Also lacking springs, which you provide.

Why would someone buy one of these? Collectors value, perhaps… the very first commercially available 3D-printed firearm magazine.

And ya gotta love the name.

Cuomo Mag