We bought a major appliance and were told that it was in stock. It was later delivered by home depot.
(Delivery people arrived three times without success, but that is another complaint.) When we wanted to return it we were told that Home Depot does not allow returns of special orders. After further questions we found out that every major appliance at Home Depot is called a special order, regardless of whether it is in stock. So my recommendation is to stay away from home depot if you want a major appliance. Be sure to look closely at the return policy, ask questions, and get responses in writing.
In our case we can return the appliance because they forgot to put a "not returnable" stamp on the invoice. But we just got lucky.
Preferred solution: Full refund.