Antonyms for the term "bargain-basement" include premium, high-end, top-notch, exclusive, luxurious, and elite. When we think of bargain-basement items, we often think of things that are cheaply made, low-quality, and affordable. However, antonyms of the term refer to items that are made with high-quality materials and are designed to be exclusive and luxurious. Premium items are also usually more expensive and come with a higher price tag. High-end and elite items refer to products that cater to a certain class of people who have a high taste and lifestyle. Therefore, antonyms for bargain-basement are all about quality, exclusivity, and luxury.