[Highland Park] looking for gently used booster seat for preschooler

Hi neighbors - Our preschooler has officially grown out of her infant-toddler carseat, so we are in the market for a booster seat (preferably with detachable back) for our car. We're willing to pay a reasonable price for a gently used, relatively new booster in good shape. So if your kids have outgrown their car seat booster and it's taking up space in your attic, please let me know. Thanks, Becky Maclean