That on sale today message was there yesterday so I don't think it literally means that it's a 1-day sale. I got mine for the starting bid price since no one bid against me ($83 w/ shipping); a new one for $200 is very good considering the retail price. This makes 1 gallon every 4 hours so ~4 gallons a day since you need to wait for machine to cool down before making a new gallon.
Please do your research first and not buy just because there is a sale--for example, some people prefer stainless steel containers, units that can hold more than 1 gallon, or units that can hook up directly to their waterline. I find that sellers will usually have these kind of promotions (esp with this economy) or, in the case of ebay, will have more units in the future.