Can't beat the Ikea chair! Other than that I would recommend a VERY simple plastic booster seat (literally look at whether it can go in the shower or under the hose to be washed! no nooks and crannies and extra plastic bits) that sits on a chair at your dining table - easy to clean, I would recommend putting a towel or something under it if the chair is fabric (I should have taken my own advice ) but that it what we use now for Mr 2.5 as he is still too little to sit on a dining chair, the Ikea chair wont fit under the dining table and this way we are all sitting together.