Casio PX-150 is a great alternative to the real thing. Decent, basic, inexpensive, and usable for the beginner, this digital piano is a great start to lasting lessons. The teachers recommend this piano for its weighted keys, adjustable stand height, and a sustain pedal. This piano comes in three types: the X, the XX, and the model pictured here.
Hailun HU5P is an award winning stand up piano.