There are a lot of manufacturers out there now. I ordered the cover from https://bozzcovers.com/ because they have a model with the front flap. It's especially convenient, because when you use it you don't have to take the cover off to watch TV. I also recommend you to use not only the cover, but to place your TV under a roof, away from direct rain and sun and in times of extreme heat or frost, still bring it into the house
