A while back, I wrote a post about the Kyle David Miller Foundation. This is a non-profit organization that promotes the use of 5-point harness car seats rather than booster seats for older children. The 5-point harness seats are available for children up to 80 pounds.
The Foundation was started by 3-year-old Kyle's family after he died in an auto accident. Kyle was sitting in a booster seat, but his seat belt failed, which caused him to be ejected from the vehicle. Kyle's death would have been prevented by a 5-point harness seat. The Foundation offers these seats at no cost to families who are unable to afford them.
Now, a sister non-profit, Hip Monkey, has been started which offers high quality car seats and other items for children, and 100% of the profits go to the Kyle David Miller Foundation. If you are needing a car seat, stroller, diaper bag, etc. . . please consider checking their site first. Their inventory is still fairly small, but you might find just what you are looking for. And you can know that your purchase is helping to support the safety of children.