sell at (something)
1. To be available for purchase at a particular price. This computer normally sells at nearly $2,000, but it's on sale for just $1,000 this week. They announced that their new product would sell at £500 for the base model.
2. To make something available for purchase at some particular location or event. In this usage, a noun or pronoun is used between "sell" and "at." He said he'd be selling all sorts of stuff at his garage sale. They started off as a niche company filling individual orders online, but now they're selling their products at stores and supermarkets across the country.
3. To make something available for purchase at a particular price point. In this usage, a noun or pronoun is used between "sell" and "at." They originally wanted to sell the video game console at $500, but when sales struggled to pick up, they reduced it to $350. In order to make a profit, we'll need to sell these at $30 apiece, at least.
sell something at something
1. to market something at a particular price. Do you think we can sell these things at four dollars each? We cannot sell these at ten times what we paid for them!
2. to market something at something or some place. We will try to sell our old kitchen sink at the flea market in Adamsville. He sold all his watermelons at the farmers market in town.
sell at something
[for something] to be marketed at a particular price. This coat formerly sold at twice this price. Next month, this will sell at a 60 percent markup.