Zula Patrol products are hard to find. Because they are easy to understand and very educational, I hope that they grow in popularity and will be easier to locate with more choices available. My 4 year old loves the Zula episodes. We are also both extremely happy with the Leap Frog videos and Squibs, although he much prefers Leap Frog and Zula to Squibs. Overall, I think the Zula Patrol is a fantastic learning aid. I was homeschooled and intend to homeschool my son also, so I love to find good quality series like these to use!