Is Abusing/exploiting Discount Codes Criminal?

Not sure if the state matters here since I'm buying online, but a physical item would be getting delivered to Colorado.

I've stumbled upon somewhat of an infinite money glitch on a web store. They are offering 20% off orders over $100 during the holidays, except you can buy gift cards on their site, the 20% off applies to the gift cards, the 20% off can be applied more than once on different orders, and you can pay for gift cards using gift cards. I'm sure you see where this is going. I'm sure this was not intended but it works. It's not a small local company, their revenues exceed 100 million annually.

I was thinking about getting an item that was ~$3000 from the site using this method. As I mentioned before, I recognize that no way on earth was this intended, but would this fall into the realm of theft criminally?