When Jonah was 4 months old, I found a great Clearance sale at Walmart. I bought several big ticket items for around $10 each. One of the items I bought was a Little People Alphabet zoo. It was regularly priced at $53 but I got it for $10 that day. I've had it put up because it was for ages 3-5.
Since Jonah knows all of his letters, I thought it might be a good time to pull it out. He LOVED it. The set came with 26 animals that all start with each letter of the alphabet. After just a little while, he could tell us what every animal is and is now working on the sounds that go with each letter and the sound the animal makes.