Hi sleeperawake,
On to your other questions 
Omalon is a high quality polyfoam produced by Carpenter.
Soy based foams (or eco foams or plant based foams or any of dozens of similar names) are somewhat of a misnomer. Polyurethane foams use two main chemicals in their manufacture one of which is a polyol and the other is an isocyanate. Both of these are petrochemicals. Plant based foam use various types of plant oils (soy, palm, castor, corn and others) to produce chemical similar to a polyol which is used to replace a small percentage (usually under 20% but occasionally more) of the petrochemical polyols in the manufacturing of polyurethane. It is a step in the right direction but these types of polyfoam are certainly not what I would call “green” and are still primarily petrochemcial based.
Precrushing foam opens up the “windows” in the foam’s cell structure and can reduce the initial break in and softening period that a foam normally goes through in the first 90 days or so.
Normally latex is correctly labeled (although it doesn’t always say what type it is) but if you see things like “engineered latex” then I would be suspicious. The best way to know is to ask the manufacturer specific questions or buy from a manufacturer or outlet that you know will give you acurate information. The law tag will also list the ingredients although it lists them by weight so you won’t be able to tell the thickness so this is not always a reliable way to know about a particular layer.
Do you know any good manufacturers in the Oklahoma City area?
Post #2 here includes some of the better options I know of and one of them is a member of this site which means I believe they have among the best quality and value in the country.
Phoenix