You can always buy AeroGarden Grow Anything kits, but it’s cheaper to buy the sponges, labels and nutrients separately, after you buy your first Grow Anything kit. You’ll often find these on sale.
You want to buy at least one Grow Anything kit so that you have plenty of baskets and grow domes (they are reusable) laying around when it’s time to reseed your AeroGarden.
Price is in Canadian dollars. The link will take you to the Amazon Store of your country.