The phrase "a steal at" is commonly used to describe something that is being sold at a very low price. To express the same meaning with a different set of words, one could use some synonyms such as bargain, deal, steal, sale, markdown, discount, or cut-rate. These words convey the idea of something being worth more than what it is being offered for. For instance, "This dress is a steal at $50" could also be replaced with "This dress is a bargain at $50" or "This dress is on sale for a great price of $50". Using synonyms gives a writer more flexibility and makes their writing more varied and interesting.