Antonyms for the word "at a bargain" include "at a premium," "at full price," "at an inflated cost," and "at an unreasonable rate." These phrases denote a higher than usual price or value associated with a product or service, and they can be used to convey the opposite meaning of "at a bargain." While "at a bargain" implies a good deal, quality, and affordability, these antonyms suggest a higher cost, a lower value, or a lack of affordability. Businesses and individual consumers alike should be aware of these antonyms when assessing the price and value of products and services, and make informed decisions based on their own budget and needs.