After probably 20 years sleeping on the same mattress (that I do flip every 6 months or so) and having a sore back every morning for months, I need to get a replacement. Just need a conventional firm spring style full size mattress. Nothing with memory foam or fancy pillow top. Copied a few examples. Is there much difference between the cheaper ones and the more expensive ones?
$160 https://www.mattressfirm.com/basic-8-25-firm-innerspring-mattress/5637163800.p
$185 https://sleephappens.com/collection...per-reedley-firm-mattress?variant=33959463052
$285 https://www.mattressfirm.com/rest-9-5-firm-innerspring-mattress/5637163768.p
$300 https://www.mattressfirm.com/essentials-sudley-8-5-firm-mattress/5637152508.p
$380 https://www.mattressfirm.com/perfect-sleeper-elkins-ii-10-firm-mattress/5637157941.p
$585 https://www.mattressfirm.com/br800-11-25-firm-mattress/5637157626.p
$160 https://www.mattressfirm.com/basic-8-25-firm-innerspring-mattress/5637163800.p
$185 https://sleephappens.com/collection...per-reedley-firm-mattress?variant=33959463052
$285 https://www.mattressfirm.com/rest-9-5-firm-innerspring-mattress/5637163768.p
$300 https://www.mattressfirm.com/essentials-sudley-8-5-firm-mattress/5637152508.p
$380 https://www.mattressfirm.com/perfect-sleeper-elkins-ii-10-firm-mattress/5637157941.p
$585 https://www.mattressfirm.com/br800-11-25-firm-mattress/5637157626.p