Hi imawo,
I generally keep all the forum lists up to date as I become aware of new information and the Jacksonville/Wilmington, NC list was last edited on August 2nd of this year and is up to date based on the information I’m aware of.
I would also make sure that you’ve read the mattress shopping tutorial here which has all the basic information, steps, and guidelines you will need to make the best possible choices … and know how and why to avoid the worst ones. It also has suggestions about how to tell if you are dealing with a knowledgeable and experienced retailer or manufacturer that is comfortable with talking about the quality of the materials in their mattresses and can help “educate” you about their mattresses or you are dealing with a retailer or manufacturer that is more interested in selling you anything they can convince you to buy based more on “marketing stories” than anything else.
If you are looking at an online purchase then the tutorial post also includes links to some of the better online options I’m aware of. If you are in a lower budget range then posts #3 and #4 here also include the better lower budget latex and latex hybrid options I’m aware of and post #4 here includes some of the other lower budget options other than latex that would also be worth considering.
There is no single mattress or comfort level that is the “best match” for a large percentage of the population so both Casper and Tuft & Needle are “all or nothing” choices where they will either be a good match for you (or at least “good enough”) in terms of PPP or you would have the option to return them because both of them have a very good return policy. With most other manufacturers or retailers (such as mattresses.net) you would have the ability to choose between different designs and firmness options or customize the mattress either before or after a purchase.
Mattresses.net and Tuft & Needle are both members of this site so they also provide a discount to the forum members here.
All of these also use different materials (mattresses.net specializes in all latex, Tuft & Needle is polyfoam which is the material used in most sofas, and Casper has a combination of synthetic latex over memory foam with a polyfoam support core) so a big part of your choice would be the types of mattresses and materials you tend to prefer sleeping on and how big a role durability would play in your choices as well (latex is more durable than other foam materials).
Phoenix