Anyone know where I can get a toddlers fold up chair?

Do you mean like a canvas camping chair? YOu can get those from camping shops, or bizarrely in motorway service stations I've noticed lately.

Or is that not what you're looking for?

You can get booster seats that go on a normal chair from Boots and places. If you are after a deck chair type thing then most garden centres have them for kids - our pound shop does too in the summer.

They had a load in wilkinsons and home bargains (was poundstretcher).