Novice, need advice quick

Hi everybody. I need some quick advice.
I need a King size mattress and box spring for a sleigh bed and have NO idea how to distinguish what’s right for me. From what little I was able to gather, major brands and stores seem to be a no-no.
I live on Long Island, NY and have don’t know of local mattress makers. I have no special physical requirement (injuries etc…) and I’m 5’9"/200lbs.
Any suggestions?

Hi mikefalz,

The best place to start is post #1 here which has all the basic information, steps, and guidelines that can help you make the best possible choice.

Some of the better options or possibilities I’m aware of in your area are listed in post #4 here and the other posts it links to.