Hi winstongt4,
I would keep in mind that the better manufacturers and retailers don’t generally “negotiate” (see post #6 here) or have “fake sales” with large discounts based on the time of year or holidays (see the guidelines here and post #5 here). While they may have sales with smaller discounts … I would treat retailers or manufacturers that negotiate their prices or have “major holiday sales” as a red flag because manufacturers or retailers that sell good quality/value mattresses don’t need to negotiate or have “fake sales” with misleading discounts to create a false sense of urgency and they sell good quality/value mattresses every day of the year at prices that are already very reasonable.
The first place to start your research is the mattress shopping tutorial here which includes all the basic information, steps, and guidelines that you will need to make the best possible choice … and perhaps more importantly know how and why to avoid the worst ones.
Two of the most important links in the tutorial that I would especially make sure you’ve read are post #2 here which has more about the different ways to choose a suitable mattress (either locally or online) that is the best “match” for you in terms of “comfort” and PPP (Posture and alignment, Pressure relief, and Personal preferences) that can help you assess and minimize the risks of making a choice that doesn’t turn out as well as you hoped for and post #13 here which has more about the most important parts of the “value” of a mattress purchase which can help you make more meaningful quality/value comparisons between mattresses in terms of suitability (how well you will sleep), durability (how long you will sleep well), and the overall value of a mattress compared to your other finalists (based on all the parts of your personal value equation that are most important to you).
Phoenix