I haven't seen anyone pointing to an actual equivalent product available for $200 with shipping. The collapsible medical chairs I've seen when searching are not equivalent devices, they're heavier, more tiring and less durable and comfortable than the kind of chair in the article. This type of chair is semi-custom made to fit the user so they don't injure themselves or have unnecessary extra medical issues from using a chair all day and out in the world.
I don't think/know there's equivalent manufacturer over seas, just insinuations it could probably be done much cheaper over seas, customization included. High performance light weight wheel chair "feels" like there's a lot of overlap with making bicycles and I find it hard to believe you can't find a shop in an East Asian bike factory that already has the machines and labourers with years of experience bending aluminum pipes to avoid amortizing capex costs. Dude wants Made In America, quick shipping time (which I wager is important) which is fine, but it's going look like a $200 product that cost $1000.