The term "bargain-basement" generally refers to something that is sold or purchased at a lower price than usual. The opposite of this would be something that is sold or purchased at a higher price than usual, or something that is expensive. Hence, some antonyms for the term "more bargain-basement" could be costly, expensive, high-end, luxury, premium, pricey, or upscale. These words signify that the product or service is of superior quality and comes with a higher price tag. While bargain-basement prices may attract some customers, others may be willing to pay more for better quality and exclusivity.