Hi remops,
I only found one link in the Memphis list here that was broken. They changed the URL for their main page so it’s now corrected.
Were there any others that weren’t working for you or appeared to be out of business ?
Some of the better online retailers or manufacturers that sell memory foam or gel memory foam mattresses that are either members here (including Brooklyn Bedding) or among the better options I’m aware of are listed in post #12 here.
Phoenix