"Regardless of cost" is a commonly used phrase to indicate that no expense will be spared in achieving a particular goal or objective. However, it can become monotonous to repeatedly use the same phrase. Some synonyms that can be used in its place include "at any expense," "at all costs," "without regard for expense," or "whatever the cost may be." These alternative phrases convey the same meaning, and using them can add a touch of variation to writing or speaking. Regardless of which phrase is used, it is important to keep in mind that the emphasis is on the importance of achieving the goal and not on the amount of money that will be spent.