I was reading about a Christmas special a company was offering to try and lure customers to sign up for its services. As you would expect, basically the service is at a discounted rate. It was interesting as this offer was given to people before who signed up with a similar offer except it was dubbed as service launch special. So they thought it would never be offered again. Sure enough it pops up today again except it is given a new title.
Sales are usually like this. The only real one time sale headlines that I usually believe that will actually be a once in a lifetime event is if the product or service is a end of life cycle type of offer. Then you know for sure that it will never pop up again. Other than that, there is usually no reason for a company not to offer it again if it boosts sales.