I was just discussing this with the owner of an independent mattress/furniture store in Seattle (Bedrooms and More in Wallingford). He is now refusing to carry non-flippable mattresses because he finds them to be too wasteful.

That's pretty cynical. High-end mattresses are generally intended to last decades--and whether they need to be rotated depends on the material.

The mattress I own now is non-flippable, and came with a 20 year warranty.