I was at Brighton Sea Life Centre at the weekend, and they have a sale on which gives you 50% off a Merlin Annual Pass which gives you free entry for a year to all of their attractions in the UK - Alton Towers, Thorpe Park, Chessington, Sea Life Centres, Dungeons, Warwick Castle, London Eye, Legoland Discovery Centre, and the Blackpool attractions when they are open. It's usually £144 so to buy this for £72 is amazing! I don't know if you can buy them anywhere else, but definitely Brighton Sea Life Centre are selling them at this price until 15th Feb.