Hi Ilya,
Post #21 here has a list of the members of the site that sell latex mattresses with a range of options, designs, and prices but all of them have good value depending on the criteria that are the most important parts of your personal value equation.
There may also be some local options with good quality/value options as well and if you let me know your city or zip I’d be happy to let you know of any of the better possibilities in your area I’m aware of.
Phoenix