You can also (in the UK at least) buy a second hand 'good brand' for about £20 from Facebook marketplace, or free if you're lucky.

You can't get one from eBay or a charity shop because ridiculously they're not allowed to sell them in case they're unsafe (eg they've been in an accident), but I imagine the actual risk to the child of gambling on a second hand one is miniscule.

We've had all ours second hand, 5 in total including ones bought for the grandparents cars, and we've spent less than £80 in total