I'm going to visit my parents and will be hiring a car for 8 days. This is costing about £150. To hire a booster seat will be £11.60 a day - AIBU to think this is ridiculous when you can buy a seat for less than this. It's for my 4 year old so I don't know whether to take his proper seat on the plane which will be a pain as it is big and I will be on my own with him and 3mo DD or to take a small booster seat in our suitcase which won't be as safe. I don't understand how they can justify charging this amount. I could take a small booster seat and then buy a bigger ~£30 one in Halfords when I get there. My parents live 2 hours drive from the airport so I would have to potentially have to throw it away at the end of the trip to return to the airport safely (I won't do this as it would be too wasteful).
You can buy an inflatable booster seat which seems slightly odd to me - anyone know if they are safe. Any other tips? Is this worthy of a mumsnet campaign? Surely providing legal seats should be an obligation.