K.S.
J.,
Babies r us has some coupons available right now for discounts off car seats. It is not safe to ever buy or take a hand me down of a used car seat. You don't know if that person was even in an accident with the seat, you can get a car seat for under 100 dollars with the coupons.
I am sorry I normally don't say anything but I have strong feelings about selling/buying a used carseat.
I agree that with trying to save a few dollars but please don't do it with your childs safety in mind. If you want to get an opinion about purchasing a used carseat contact the people who install the carseats (fire depts, police depts) they will explain why not to do that.
http://toysrus.shoplocal.com/toysrus/default.aspx?action=...
If you use this link - go to the last page of the toys r us ad - you will see a coupon for 20 dollars off a car seat.
good luck