Sealy Posture Premier Single mattress $199.99
Stores seem to stock this mattress under different names – same product just with a different tagline. At Costco its the Posture Premier.
We shopped around and this mattress was anywhere from $260 up to $400+ at the usual suspects such as Harvey Norman and BedShed.
Its a firm mattress – our 11yo said it felt too firm for the first week or so, but then it seemed to reach a point of being broken in and she loves it.