My mother in law just got married, her husband (my step father in law?) has a grand daughter that spends a great deal of time with them. They currently have her in a backless booster that is pretty much in the worst shape I have ever seen a seat, it must be at least 15 years old I wouldn't doubt this is the same booster her mother sat in at her age.
So what is the cheapest safe option for a high back booster for a 6 year old girl? She is very average sized (I think) I really don't know too much about the average size of a 6 year old. The longer the seat can be used the better. I can explain to my MIL that she needs a high back booster (vs no back) because its safer but convincing her to buy a more expensive high backed booster over cheaper one would be very difficult if not impossible(she is very.... frugal). The seat will also need to be readily available at a retail location. She has a Target, Walmart, and Costco near her.
Thanks for the help! I tried searching the forum for threads but almost every post I saw reccomended a more expensive seat like a britax (Which she absolutely will not buy I dont see her spending more than $75). I
As a side note, is it illegal to use an expired car seat? If I can tell her that I am sure she will buy one right away.