Just picked up a Casio WK-110 keyboard for my kids' piano lessons. Toy 'R' Us has them on clearance for $130, down from $200. They must be making way for the new WK-120 model. Hopefully this can tide us over for a while until we can get a nicer digital piano with pedals and hammer action, which usually run in the $500 - $800 range.
My old Yamaha PortaSound that we had been using finally broke... or at least it's at the point where it can only play drums while on battery power. I've had it with me for the better part of two decades. But the keys were small and didn't have any kind of touch response.