You can find them on Gumtree and ebay and at garage sales (or maybe even stashed in your shed or garage?)
They still sell them at Ikea in various forms (the Poang chair) from $189 on up. They're a useful piece, solid construction and can squeeze into a tight spot.
Obviously this one had seen better days — what better to play on?
The awesome thing about painting this chair? The seat cushion and headrest slipped right off the frame.