At-home rapid COVID tests at your local pharmacy is running very low and hard to find. They also cost $10-15 each. NJ Department of Health is currently paying for free saliva test kits for New Jersey residents. Read about this program here. Order your free test kits here.
Please plan ahead and order these kits. It will take time for the kits to be shipped to you and for you to ship the kits (no shipping costs) back, followed by 2-3 days of waiting for results. It’s not perfect but if you are not in a hurry and can plan ahead, it can save a family of 4 about $60 each time you need to have a negative test before you can go visit the grandparents.