90 day return policy so I am willing to take a chance. Also, the viscous mattresses from Sams are all priced under $650 from Kings.

Has anyone ordered any of these? 

The fact is, you bought a mattress that you have know idea what it is made of.  It's cheap.  Theres a good chance it is a chinese import which don't carry the same regulations as U.S.  manufacturers.  In a few months you might be sleeping in a hole.  Then you'll be back on this forum preaching how bad memory foam is.  Take that thing back and spend your money on a cheap firm mattress and put toppers on it as needed until you can afford a good quality set.  Thats just my opinion.  You get what you pay for.