Hi jdg9970,
The first place I would start your research is the mattress shopping tutorial here which has all the basic information, steps, and guidelines that you will need to make the best possible choice … and more importantly know how to avoid the worst ones.
The tutorial also includes a link to a list of the members here that sell mattresses online (in the optional online step) that compete well with the best in the industry in terms of their quality, value, service, and transparency. Many of them make latex and latex hybrid mattresses (including component mattresses) that use different types and blends of latex that have a range of different designs, options, features, return and exchange policies, and prices.
The tutorial also includes a link to a list of the better online memory foam options I’m aware of as well (also in the optional online step).
Phoenix