Baby shopping nightmare

I went shopping for baby stuff on saturday. We already have loads of clothes and stuff, so really we were just after esentials like towels, monitor pram, car seat etc! I had hoped we would come home with it all! I had found the travel system that looked good, it was one of those ones where you can either have a pram, car seat or pushchair on the frame. So we tried the car seat in the car, no problems, then we tried to put the push chair in the boot of the car! There was no way that was ever going to fit, so we tried a couple more with the same result. We only have quite a small car (toyota Yaris) and although there is an option to chose between boot space or passenger space, the rear facing car seat needs alot of room. The next option was a new car! Really dont want to buy a new car, our savings have only just recovered from moving house and we would like at some point in the next fourty years to buy our own house. We found a really expensive travel system which I think will fit in the car, but we need to go and try it before we buy it since it costs over £700 but is still cheaper then a new car, although more then my brother would pay for a car!!