These companies aren't expensive, considering their growth so far and long-term prospects.Everyone is talking about artificial intelligence (AI) these days, and for good reason. This hot technology that's driven some stocks to triple-digit gains has the potential to transform everything from our daily lives to how a company operates. AI's powers range from the simple, like helping us save time on a routine task, to the complex, like helping scientists more quickly discover a game-changing drug.Companies are ...