Was just making another regular trip to everyone's favourite store (except for those who didn't get their $300 projector) and saw these sitting just inside the door. For $20 these seem like a great deal. There were 8 available at the time of posting. Not sure if national but clearly clearance price so YMMV.
eBay link for some more info & photos
3yr warranty
130kg weight capacity
Features chair & seat tilt as well as height adjust
Seat width 505mm
Wow, that's good.