One more thing, as my kids got older and needed seats for bigger kids, I went to a county sponsored car seat check. Although we didn’t fit the income guidelines for the free seats, we were able to purchase them at a very reduced rate. The county gets them at cost from national makers and passes them on for that same cost. We paid $47 for a carseat that we had looked at in Walmart for $89.
The best part was that they were able to show us how to properly install it! Something to look into weather or not you meet income guidelines.