I got the best deal with the DC room only code - ZWFK. Booked Beach Club standard 08/16 - 08/25 at $209.90 per night. I'm pretty sure this rate is exactly the same as the new summer saver rates that just came out. I found it better than the AP rate, however.
Also, I had called the Dolphin first but couldn't get the 50% entertainment discount for this timeframe. We stayed there last August using that discount, but no go this time.
We enjoyed the Dolphin last year, but I'm very excited to try BC!