Looking for a deal on booster seat

[kriszta]

I need to buy a booster seat for my 4yr old and i was wondering what is a good price on new and used.
I want to get the one with the back.
Also can you take these on an airplane free too? I know they let you take the car seat and baby carrier, so i am hoping they will let me take these too.
I need to get one the next 2 weeks.
Thanks for any info

[Desert Debbi]

You might want to check out programs with your local law enforcement or fire department for a FREE one. I often see/hear them advertising free ones out here in AZ. Also, we recently got a spare one for our son/ sons friends for about $25 new at Babies R Us. Its a booster seat that literally is just the chair seat part. There are no fancy straps to it, and its easily removed to let an adult sit there, or to take on a plane. Our son is also 4yo and has been very well behaved in it, once he understood the rule that he cannot undo the seatbelt until mommy and daddy said it was ok =D