Got it of the phuket.com site; it was the featured hotel of the week / month when I was booking. The offer still seems to be up on their own site...
http://www.allamanda.phuket.com/rates.htm
The best thing about it is the rooms are very big, but after having stayed there, I would suggest coughing up the exta $15 for an upgrade from a junior suite to a one bedroom.
Their spa is called The Angsana.