Hi flybear,
If you let me know your city or zip code in Colorado I’d be happy to let you know of any better options or possibilities I’m aware of that may be close to you.
Is your son’s allergy Type IV or type I?
If it’s type IV then a latex mattress would usually be fine (you can read more about latex allergies in post #2 here and the thread it also links to). If it’s type I (which is a true latex allergy to the proteins in the latex rather than a contact allergy) then this is quite rare but this means that any natural latex should be avoided (synthetic latex doesn’t have the proteins that are the cause of the latex allergy).
Phoenix