Cheap Digital Pianos

 Include LED Display, USB/Headphones/MP3 Input, Music Music Stand, Adjustable X Stand, Power Supply, With Music Player, Suit for Kids Adult Beginner.

For under a hundred dollars, this is a pretty solid choice. Lagrima is not a known brand. However, this set includes a stand for the piano, which makes this a pretty great value.

Includes App Integration/Dance Music Mode

Casio is a trusted brand. It doesn't have the same amount of authority as Yamaha, so I would recommend going up just a little more with the Yamaha.

Includes Power Adapter (Amazon-Exclusive)

Yamaha is a highly respected brand, so you can trust this brand. Reviewers loved this keyboard and praised it's great value. This would be a great budget-friendly starting digital keyboard for beginners of any age.

 Inclues Interactive LCD Screen & Includes Piano Maestro Teaching App with 30 Songs

Includes LED Display Electronic Rechargable Piano Keyboard with Microphone Multi Functional Piano for Kids 

Very cheap, budget friendly option. Very small keyboard, perfect for very young children (toddlers or younger) to play around on for fun! For the price, it's a tremendous value. Of course, no weighted keys, not the full size keyboard. It's a toy meant for kids, not a serious instrument.