Hi eeks,
That’s certainly possible because new latex layers can have discolorations or imperfections that are completely normal.
If you let me know your city or zip code I’d certainly be happy to let you know about the better options or possibilities I’m aware of in your area.
If you are considering online options then the mattress shopping tutorial includes this link to a list of the members here that sell mattresses online (in the optional online step) and many of them also sell latex and latex hybrid mattresses that use different types and blends of latex that have a wide range of different designs, options, features, return and exchange policies, and prices that would be well worth considering.
A latex hybrid mattress with a polyfoam support core will generally do best with a firm, flat, and evenly supportive support surface underneath it that has minimal to no flex under the mattress and for larger sizes with at least one center support beam that has good support to the floor to prevent any sagging in the middle of the mattress. The components (either a bedframe and foundation or a platform bed) need to be strong and durable enough to support the weight of the mattress and the people sleeping on it without some of the parts bending, sagging, shifting, or breaking with extended use. The support surface under the mattress (which may be slats or a steel or wire grid) should have enough surface area to prevent the mattress from sagging through any gaps or spaces in the support surface over time but still allow some airflow under the mattress. If a foundation has a slatted surface then I would suggest that the gaps between any slats are no more than about 5" (with 1 x 3 slats) although less than 4" would be better yet unless the manufacturer specifically recommends even less than that to satisfy their warranty criteria.
If you purchase a mattress that is all latex (with a latex base layer) then I would make sure that the distance between any slats is no more than 3" (and once again less would be better yet).
A box spring has springs inside it that flex under the mattress and there are very few one sided mattresses today that use them as a support system and in many cases they will invalidate a mattress warranty. Most mattresses in the industry today need a steel or wooden bedframe with a foundation that has minimal to no flex (vs a box spring that flexes) or a platform bed which also has little to no flex under the mattress. There are many in the industry that mix up the terminology between box springs and foundations even though they are very different products.
While there are a few thinner all latex mattresses (generally two sided and about 6" or less) where the manufacturer may specifically recommend a box spring or a flexible slat support system to provide some additional “comfort” and more contouring “deep support” in the mattress … unless they are specifically required or recommended by the manufacturer I would limit your choices to a support system that has little to no flex under the mattress.
Phoenix