I use 'Oodie' as a generic name, a bit like 'hoover'. Mine was about £40 from Amazon, and is not the branded one, but is so good I got one for the lodge, too. I can't imagine what could be better if I paid twice as much, and I don't care for most of the 'cute' designs of the Oodies.
What are the 'horrible selling tactics'? I've seen them bundled with blankets and things, but Kuddly does that too. I do love mine, and they are particularly good for throwing on when you get up, or after a bath, as they look less like nightwear than dressing gowns. My sitting room door is draughty when the wind is in a particular direction, and the hood is great for preventing earache as it hits just where I like to sit when I'm knitting. I do recommend them, but I don't think you have to pay £££ for them. My daughter has a branded Oodie, and it's about 2 inches longer than mine, but is otherwise no better, as far as I can see.