Hi Olichar,
The listed prices of the PLB mattresses have MAP pricing (minimum advertised pricing) and there are some dealers that sell them for this but dealers are allowed to sell for less as long as they don’t advertise it and they are certainly available for much less than the prices you are mentioning.
There are some PLB dealers that will ship across the country in post #32 here that you can call to use as a reference point but as Tahoegirl mentioned I would start by giving Jeff a call at Matt-To-Go.
Phoenix