There are a few BIG baby purchases that you just can't avoid - one is usually an all-singing-all-dancing-could-probably-cook-the-dinner-for-you-if-you-asked-nicely pushchair and the other is a stage one car seat (stage one seats are for babies/toddlers weighing between 9 and 18kgs which is generally between 9 months and 4 years).
I have always had Britax car seats and the last one I bought back in 2007 cost me over £130 - I won't compromise on quality and Britax is a name you can trust but if I could have paid less then obviously I would.
Britax seats are big and sturdy and the sides are well-padded and side impact protection - I always feel that my kids are well-protected because of these big 'winged' sides that they have.
The seat actually tips forwards so that you can easily thread the seatbelt though the fixings, which I think is a stroke of genius and will save your sanity and hours of time fiddling around behind the seat trying to get everything in the right place and not twisted. It also has a five-point safety harness that tightens up with just one pull which is incredibly useful as it saves fiddling around trying to evenly adjust two straps.
The rrp for this car seat is £149.99 so I wouldn't hang around thinking about whether or not to go for this deal for too long, oh and it also qualifies for the Super Saver free delivery too.