Great info on this thread.
I'm also in the market.  Looking closely at the Pulse and Optima.  Haven't wet tested yet, but will once I have an idea of what price I can realistically expect to pay.   
I get the different business models among spa dealers and dealers who might want to acquire a new customer and sell other items.  
I am in the San Francisco bay area.   Anyone know what a competitive price here might be for a Pulse and/or Optima without any options?  The stereo is nice, but not worth a big premium. The dealers for both brands are including the cover, steps, start kit, and delivery.      
From what others are reporting across the US, looks like a good price could be between 8500-9500. 
Any advice that hasn't already been provided on this thread to help negotiate a good price?  I see mention of promotions.  Anyone know the promo cadence and when the best time to buy a tub is?  Is this dealer specific?
Thanks in advance for any input.
Michael