It wasn't one of the iSerta Series was it - I recently saw this one on an ad on TV:
Serta® Perfect Day® iSeries Wake up every morning feeling refreshed and energized for your busy day ahead with an Perfect Day by Serta mattress. The all-new Perfect Day mattresses feature Serta’s revolutionary iSeries™ technology, combining Serta’s finest comfort innovation with our most advanced coil support system. Every Perfect Day by Serta mattress is crafted down to the greatest detail to help address today’s most common sleeping problems. The result is a better night’s sleep so you wake up totally invigorated, revitalized and ready to be your best all day, every day. As Serta’s top-of-the-line collection, Perfect Day boasts some of the most advanced comfort and support features available including Serta’s exclusive Cool Action™ Gel Memory foam with our most advanced Duet™ Coil Individually Wrapped Coil-in-Coil Support System.......found at: Serta Perfect Day ISeries Mattress on Sale