When looking for alternatives to the phrase "top price," several synonyms can be used to convey the same meaning. One such synonym is "premium price," which suggests a higher cost due to the quality or exclusivity of a product or service. Another possible synonym is "highest cost," which simply refers to the most expensive option available. "Maximal price" can also work, implying the upper limit of what someone may be willing to pay for a product. Lastly, "peak price" can be used to describe the highest point in the spectrum of pricing, often associated with luxury or high-end items.