Hi sidesleeper,
Thanks for the kind comments … I appreciate them 
I think that making meaningful comparisons to other similar mattresses that are either available locally or online is always a good idea because the “value” of a mattress purchase is always relative to how it compares to other similar mattresses that someone is considering or is available to them based on all the parts of each person’s personal value equation that are important to them. For those stores where the listed prices are negotiable (and I would always ask if the listed prices are the best price available) … the percentage discount that may be deducted off listed prices that may not be the best price available and may not be the regular selling price is less important than how it compares in apples to apples comparisons with other similar mattresses.
Phoenix