Antilop from IKEA.
The best. And cheap. So not all cheap stuff is nasty. Comes with a blow up insert for younger kids and its the only one that would get DS to sit up straight in and not slump down and bump his chin on the tray
Just wanted to second (or third?) this recommendation. Excellent highchair, easy to move and clean. A must have in my opinion for only $40. I would pay top $ for it as it's so good and easy to keep like brand new.