Yamaha P-125 digital piano $480 (%600 - 20% off coupon)
Currently Musician's Friend has a father's day 20% off deal, if you call or chat them, you DON'T need to supply the coupon code. (For Yamaha gear, you have to call/chat them anyway to apply discounts.)
Unfortunately, the 20% off expires today. So better hurry. If you miss it, don't worry, there's a 15% July 4 coupon that kicks in after.