Hi stuuke,
The “regular price” of a mattress isn’t a reliable way to assess the “value” of a mattress purchase or whether you are getting a “deal” because if the regular price is the MSRP (manufacturers suggested retail price) it’s generally highly inflated and has little to do with what the mattress usually sells for and is generally more about marketing than anything else. Even that is assuming that the mattress would be worth buying at any price because I would avoid any mattress that uses lower quality or “unknown” materials regardless of the price.
The information in post #15 here about price vs “value” would also be well worth reading.
I thought you were buying 2 mattresses rather than 3 but regardless of how many mattresses you are purchasing the only way to assess whether you are getting a “deal” or not would be to compare them to the other finalists you are considering based on their suitability, their durability, and on all the other parts of your personal value equation that are important to you (including the price of course).
Phoenix