YOu might want to check to see if Dreams Unlimited Travel, Allearsnet.com or Mlousesavers.com can get you a better deal on the Dolphin.
Also, call their reservation number directly and ask if there are any specials. I've always gotten better rates by calling them directly over the ones you can find online.
The rate seems pretty good considering what WDW is charging for their hotels. But, I will be calling them because they are in the Entertainment book, so I will see if that rate is available. If not, I will ask what other rates they have. The rate I found was a "special" rate on their website.
The weekend I'm looking at the rates at the Mods were $215 for that Friday and Saturday. The Values are $139. The Dolphin is coming up $159. I thought that was pretty good.
It is the same price on the Wed and Thur leading into the weekend, but the Mods are only $119.20 with AAA (Values $65.60).