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That's an amazing price. The Retreat sells for $4,595 at my store. The Retreat wasn't available in 2005 though, there was a spa called the 415 that had the same shell but was 5" taller. Are you sure it's not a 415?
It's probably an 06, they didn't make the Retreat in 04. Again, that's an awesome deal. We charge $4,595 + $250 for the cover lift, so you're definitely getting a good price. What dealer are you working with?
When is a price too good to be true? Why would a dealer sell a spa so cheaply?
at that price, you might want to ask him about doing the electrical upgrade to 220. Espically so if you are bringing out and electrician to wire for the 110. Might as well do the 220. imho. just a thought....