Hi SleeplessinDallas,
Yes Tempurpedic sells their mattresses with a solid surface foundation. A google search on Tempurpedic mold will also bring up reports of mold or mildew under Tempurpedic mattresses as well.
You can see my comments about a solid support surface under a mattress (such as plywood or MDF) in post #10 here. While in most cases they would probably be fine … they can be an additional risk factor for the formation or mold or mildew … particularly if there are other risk factors involved that could contribute to the formation or mold or mildew in a mattress. The risk would probably be lower with an innerspring mattress.
Phoenix