Hi moon1234,
Welcome to the Mattress Forum! 
Yes, latex foam as a raw material has gone up in price since 2010, along with other raw materials and associated costs, such as shipping.
I think highlyof SleepEZ as well (they are site members here). Their 9" Natural Latex Mattress will give you more options for both customization and a more common comfort choice for someone eventually reaching adult size. You can choose between natural Dunlop or blended Talalay using a natural cotton quilted to Joma wool cover. Most people that are looking for an “organic” mattress or materials are usually concerned more with “safety” than whether the materials have an actual organic certification and they usually aren’t aware that an organic certification isn’t the same thing as a safety certification. There is more information about the three different levels of organic certifications in post #2 here and some of the benefits of an organic certification in post #3 here and there is more about the different types of organic and safety certifications such as Oeko-tex, Eco-Institut, Greenguard Gold, C2C, and CertiPUR-US in post #2 here and more about some of the differences between organic and safety certifications in post #2 here and there are also some comments in post #42 here that can help you decide whether an organic certification is important to you for environmental, social, or personal reasons or whether a “safety” certification is enough.
Whether from a company’s web site or on amazon…and while other people’s comments about the knowledge and service of a particular business can certainly be very helpful … I would always keep in mind that you are the only one that can feel what you feel on a mattress and I would be cautious about using anyone else’s suggestions, experiences or reviews on a specific mattress (either positive or negative) or review sites in general as a reliable source of information or guidance about how you will feel on the same mattress or how suitable or how durable a mattress may be for you (or your children). In many if not most cases they can be more misleading than helpful because a mattress that would be a perfect choice for one person or even a larger group of people in terms of comfort, firmness, and PPP (Posture and alignment, Pressure relief, and your own Personal preferences) may be completely unsuitable for someone else to sleep on (even if they are in a similar weight range). In other words … reviews or other people’s experiences in general won’t tell you much if anything about the suitability, quality, durability, or “value” of a mattress for any particular person (see post #13 here).
Latex For Less has been discussed previously here on the forum. The phone and address listed for Latex For Less is the same as listed for The Natural Latex Company, and also the same as for Plush Beds. The former two seem to be names used for online channels of selling product at places like Home Depot, WalMart, etc.
Sometimes a mattress manufacturer will produce the same (or similar) product under different brand names (but still own all of those companies). Other times, a mattress manufacturer will produce their own branded line of products but then serve as a licensee where they are the actually assembler for other brands. And then sometimes mattress manufactures will produce only their own lines of products. It’s all quite varied.
I can’t speak to all of the operations coming out of the address you listed in Moorpark, but SleepEZ focuses primarily on their own products. I think you’ll also find a difference in the level of embellishment in the information presented in the multiple sites you mentioned versus SleepEZ.
They wouldn’t be the actual producer of the latex, so they would source their Talalay from either Talalay Global (used to be Latex International) or Radium, and their Dunlop could come from multiple sources. Manufactures will often use multiple suppliers. Either way, I would consider the latex to be a good quality and durable material.
What I trust is irrelevant, as you are the one purchasing the mattress. 
The information you need to know about any mattress is listed in this article, and as long as the materials within the mattress are of a better quality and you are comfortable with the company with which you’re dealing and everything else meets with your own personal value equation, you should be personally comfortable with any purchase you make.
Mattress sold within the USA are required to meet 16 CFR part 1633. They would be required to have burn prototype results on file.
I’m not sure where you read that about needing 1" of wool, but it wouldn’t be a necessity. There may be other materials within the mattress to assist with meeting federal flammability regulations, including materials that can be blended with the wool and things like an unobtrusive FR sock that can be wrapped around highly point elastic materials like latex. I’m not sure of the exact mechanism they use to pass 1633, and they’re not required to disclose that. But you could email and ask them.
Common “latex water-based” adhesives incorporate various types of elastomers (including but not limited to natural or synthetic latex) in different quantities as opposed to adhesives that use solvents (rather than water) and which often have higher levels of VOCs, and these are commonly used in the industry. There is some good information about different types of adhesives here and some information about some water-based and different types of latex adhesives here that may be helpful to you.
Simalfa has been discussed previously here on the forum (you can perform a forum search by clicking on Simalfa here. Simalfa 309, a common adhesive for use with latex, is even Greenguard Gold+ certified.
I hope that helps to answer some of your questions!
Phoenix