Groupon has Sealy Response Premium 14" Pillow Top Mattress Set in various sizes and Plush or Cushion Firm with free standard or low-profile foundation.
Twin XL $559.99
Cal King $749.99
All available in Plush or Cushion Firm and come with free standard or low-profile foundation (or you can choose to go without).
Sealy's Response Premium is one tier higher than their Response Performance innerspring mattresses. This should be the 2017 version, which Sealy replaced with the Posturepedic Plus line this year. The same King mattress on Amazon [amazon.com]
or HomeDepot [homedepot.com]
is currently $840 without foundation/boxspring.
Free "White Glove" delivery but the fine print implies only threshold delivery may be available due to Covid.