I purchased a kitchenaid dishwasher from here for $75. They helped me load it in my niece's SUV and I installed it myself (thanks YouTube) and it has been working perfectly for over 3 years.
It was used in a model home, so it was like getting a new dishwasher.
I highly recommend visiting here before you stop at Lowe's or Home Depot. It supports a fantastic cause and keeps things out of the landfill.
They also have lots of new home decor and a section of used books the kids can peruse while you are measuring sinks :)