We have 2 cars, 3 children.
3 car seats in my car
2 car seats in DH's car.....that way if i get stuck, car gets stuck etc, there is always DH car and DD (5yrs4mths) can just sit in the back with seatbelt.

I dont know how i managed with so many car seats, but for me, i paid someone to install the maxiriders in my car, i wasnt going to risk ever taking them out so my mum, or DH can fit them in their car should the occasion arise...i know, know, know, i would never get it to fit as good as 'they' fitted it. I got my other 'cheapies' on ebay. I know there are a lot of shonks on there that sell dodgy car seats, but these were 2-3 years old, lookd in good nic, and i only paid $50 and $65 respectively......