Buy at is a common phrase used to describe purchasing something from a specific location or at a certain price. There are many synonyms you can use to convey the same meaning such as purchase, acquire, procure, obtain, and get hold of. All of these terms suggest the act of buying something, whether it's a physical item or a service. By using these synonyms, you can add variety to your vocabulary and express yourself in different ways. For instance, rather than always using the phrase 'buy at,' you might say 'I procured the item at a discount price.' It makes your language more interesting and engaging.