I made the mistake of buying a new mattress through a chain retail store and i have to return it. My only option is an exchange & I have to buy a mattress from one of those "S" brand companies. Does anyone know a good quality firm innerspring mattress that would last me a long time? I plan on buy my own toppers this time instead of buying a cushion firm mattress. Thanks:)

I spent a lot of time researching mattresses this spring, and very few on the market have a true inner-spring component.  If you leave on the East Coast, you can find them at The Original Mattress Factory in the Pittsburgh area.  They are one of the few brands out there who make a flippable mattress made of high gauge and quality springs. Most major brand mattresses today are one sided and have excessive amounts of foam.  Check for them online by the company's name...Good luck hunting...