Hi drave199,
The first place I would start your research is the mattress shopping tutorial here which has all the basic information, steps, and guidelines you will need to make the best possible choices … and know how and why to avoid the worst ones (including the major brands such as Sealy/Stearns & Foster or any mattress where you don’t know the quality of the materials inside it). Just as a preview it would also be helpful to read the guidelines here.
I would also avoid “fake sales” based on a phony retail price and treat them as a warning sign rather than as a benefit (see post #5 here).
Better manufacturers and retailers sell their mattresses at good prices every day of the year so I would never let any of these sales tactics give you a false sense of urgency.
Phoenix