Some mattresses but not all have fully organic material. Check the tags of the mattresses to be sure.
You can try checking out sleepies for seally mattresses as they sell all designs and makes of mattresses to fit the customers comfort You can also try checking Macys or jcpenny as they also sell mattresses
Tempur mattresses do cost more money but then again all mattresses cost money, however the tempur mattresses are made of really really good quality to make sure you have a great night sleep. If its worth it then go get it.
Visco foam mattresses are often referred to as a "Memory Foam" Mattress. These Visco mattresses are better than other types of mattresses because they adjust to the persons body that lays on the mattress.
Latex foam mattresses are currently gaining popularity over the traditional spring mattresses. A latex mattress provides a precise amount of firmness and pressure for a person.
Organic crib mattresses are made with only organic materials including organic cotton. They are likely to be kinder to skin and more hypoallergenic than regular crib mattresses.
All places that sell mattresses always claim to have cheap mattresses for sale to improve their sales. Many stores have yearly sales to increase business.
because diffrent companies make diffrent size mattresses or diffrent size bunk beds
nothing happens, but if you eat to much you will get constipated.
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To create a king-sized bed, you simply need to push two twin mattresses together and cover with one single, kind-sized fitted sheet. This works best when the twin mattresses can sit flush against one another; ideally, this happens on the floor, or within one king-sized mattress frame. The twin mattresses can also be pushed together if they are sitting on top of two twin mattress platforms that do not have walls around the outer edges of the mattresses.
Well, there are a lot of different types of mattresses, in general there are - innerspring mattresses (has the longest history and has the largest market share) - memory foam mattress - latex mattress - air and water mattress Each of them has its own pros and cons, you need to decide which one you need based on your own budget and your main concern with sleeping. I have include 2 links where you can look into more details about mattresses and different types. Hopy my answer helps