Here's a shout-out for a neat program.http://www.freepianolessons4kids.com/index.html
Piano lessons are free on YouTube, you pay for their e-book with materials for the lessons, if desired. But you don't NEED them. They're just nice to have. And you don't have to play the piano, or even have a piano, for the videos to be beneficial. My 2-year-old hasn't practiced, but he has loved the short, to-the-point videos. You can learn a lot from the videos alone. He's really done a great job putting this together.
I got to do a review and giveaway, but they're not paying me to come here and recommend it. I honestly do recommend it.
It's very EL friendly, and it's budget friendly too. http://www.professional-mothering.com/2013/05/free-piano-lessons-4-kids-review.html