Standard prices can sometimes feel limiting, but there are plenty of other ways to describe them. You might use "fixed prices" to indicate that the prices are not subject to change. "Regular prices" suggests that these are the prices that are commonly charged. "List prices" can be used to indicate that the prices are published in a formal list. Or you might use "base prices," "established prices," or "set prices" to describe prices that are predetermined. Whatever term you choose, it's important to be clear about what you mean to avoid any confusion.