Today only. Musicians Friend has the Williams Allegro 88-Key Digital Piano for $260 with free shipping. Gear One G40DX Headphones included with purchase. Features 88 touch-sensitive hammer-action velocity-sensitive keys, 64-note polyphony, 8 piano & keyboard sounds, demo songs, metronome, two-track recorder, and includes music rest and sustain pedal. if you prefer, Guitar Center has the keyboard alone for $255 shipped with code EAST15 [Exp 4/9]. Thanks, pdxalz! 
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Guitar Center has this for $300 and a coupon for 15% off for a total of $255. Plus you can do in store pickup.
This is a surprisingly good lower end digital piano. I can't think of a better value at the under $500 price. I bought one and used it until I could buy another acoustic piano, and I was very pleased. A tip - there are many "hidden" features and functions that require the owner's manual to discover. I've read complaints, and after owning one I've realized that the user had likely changed operation modes by mistake.
Note that B stocks of these are often sold for less. I paid $220 delivered for mine.