You can get a $30 Walmart gift card for brining your old baby car seats in to your local Walmart.
It cannot be a booster seat and you must have a valid photo ID.
According to Walmart:
Have an old car seat? Come in on September 16-30 and give us your old car seat(excludes booster seats) to be recycled and in turn you’ll get a $30 gift card that can be used in store or online to buy items for your baby! Limited 2 per household.
Check with your local Walmart to make sure they are participating.