Hi MS,
I would be very skeptical about buying a mattress on ebay and my own thoughts would be similar to buying from a liquidation outlet which I posted in post #2 here.
A Tempurpedic would not be shipped compressed, would require truck shipping, and would be a 2 person job to carry it to the bedroom and set it up. Recourse for defects or damage that were not incurred in shipping could be problematic if you didn’t know the vendor. I would be very careful and buyer beware.
While I don’t mean to imply in any way that all ebay sellers are bad … they aren’t … but it would be very important to me at least with something as important as a mattress to be able to validate any sourcing and to validate the integrity of the vendor.
Phoenix