I don’t know if this has been posted or not but I was reminded of this site today and I signed my toddler up for it. I liked it but it would be better for an older child. www.wonderzone.com
www.cefonline.com also offers Bible lessons that comes in the mail that you get a certificate at the end and a free book that is great, (as fas as I have read).
They also have curriculum books that you can purchase for preschoolers.