Hi Themattressman,
Posts #2 and #4 in here has a list of factory direct manufacturers that are close to you. A look at their sites shows that at least two of them make microcoil mattresses (Sigma and Flybynight which sells the Berkeley ergonomics I linked earlier) and some of the others may as well (a few quick calls will find out). They would also give you the chance to test this type of component against other options to see how it feels for you in “real life”.
You have some very good options available to you within reasonable driving distance 
Phoenix