Zinus 12 Inch Performance Plus / Extra Firm Spring Mattress, King sells on Amazon. I think the price is very good. Please read some of the reviews and see what people thought of the product. Do check how you might qualify for a free shipping offer if available.
- Swirl Gel Memory Foam comfort, ViscoLatex Memory Foam technology, and iCoil Spring Support
- Foam & fiber quilted comfort cover
- Only the highest Quality of memory foam – all foam is CertiPUR-US Certified for durability, performance, and Content
- Smartly shipped- Our patented technology allows Our mattresses to be efficiently compressed, rolled and shipped in a box conveniently to your door
- Worry free 10-year limited warranty
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