Hi viper,
The better options or possibilities I’m aware of in the general Chester, NY area are listed in the Middletown, NY list in post #2 here and in the West Milford, NJ list in post #2 here but you would need to call them to see if they carried any latex or latex hybrid mattresses on their floor.
Other than that … there are some better options than these in the New York City area in post #2 here and the Monroe Township, NJ area in post #7 here (with some overlap between them) and posts #2 and #4 here for Connecticut but they would involve a longer drive.
Phoenix