By Dave Snelling Anyone with an ageing Fire TV Stick that’s starting to stutter might want to take a trip to Amazon’s website. The online retailer has launched a huge end-of-year sale which even includes a massive discount on one of its newest streaming devices. The latest Fire TV Stick 4K was only unveiled back in September and, for a limited time, there’s huge money off. At launch, this powerful streaming stick cost £59.99 but that is currently slashed to just £39.99 – that’s a huge saving of 33%. Amazon even says that those ordering today should have it popped through the door before Christ…