Finally ordered and it arrived today.
the washer did come bundled with an adapter. There was the round twist-lock type plug on one end which ran into a plastic electrical box with two NEMA 6-15 outlets on it. This is probably what you're looking for. In my case, it came with the washer.
Mine didn't come with this adapter. I'm going to look around for it, along with having the outlet changed out. I think it's going to be easier if I have the outlet changed out to the 4 prong NEMA 14-30R and use the adaptor, vs wiring it for NEMA 6-15 and having to change it back when I move.