Which booster to transport a friends child two days a week to school and back??

[RatOnnaStick]

We both need an extra seat in our cars to make the school run work between us. Its got to be easily stowed in between times and as low cost as possible. Not prepared to just get a crappy backless booster.

I've looked at Which but none of the cheaper ones look any good. Help?

You can sometimes find Britax Adventure hbb for about £30. We have this for my son as it's narrow to fit between two other seats.