Check out Hoffman academy… the videos are free and the first part doesn’t need much more, so you can try for free. Also, Duolingo music is free.

DD is 8 and interested in piano. We have a piano at home but private lessons are a little pricey for us right now. I'd be happy to pay $100 or something for a high quality app or other set of learning tools. If she really takes to it then we could maybe think about moving to private lessons at a later time. Any suggestions?