The cult-favorite plastic-and-metal seat that costs about the price of a takeout dinner and hoses clean in seconds.
Ask a room of parents for the best cheap high chair and someone will shout 'the IKEA one' - the Antilop is that beloved. There are no crevices, cloth, or padding to trap food, so you can wipe it down or literally rinse it in the shower, and the legs pop off for flat storage or travel. The trade-offs are real: there's no recline, no height adjustment, and the tray is famously a bit of a reach for small arms (many parents buy an aftermarket tray insert). It's best once your baby sits up unassisted around six months, and it won't grow with them - but at this price, you won't care.