There is an intranet site for discounted crew holidays. They also send a monthly (I think) email with hot deals. I’ve not used it myself yet, but I know of colleagues who’ve saved thousands, or got a really cheap last minute break. I think it is very much on their terms, such as; availability, resort (probably not top tier), seasonal, load factor/ room capacity etc. so can very much depend on how flexible you can be with dates, location etc.