If you're in search of different ways to express the phrase "worth a pretty penny," you could consider using synonyms like valuable, pricey, expensive, costly, premium, high-priced, or high-value. These words allude to a particular object or experience having a high value or cost, implying that it's a significant investment to acquire or possess. Other phrases that convey a similar sentiment may include "worth its weight in gold," "worth a small fortune," or "worth every penny." Ultimately, the key takeaway is that the phrase "worth a pretty penny" connotes a level of substantial worth, and there are multiple ways to communicate this idea.