I can get £12 for Until Dawn at Game, and there's one literally across the street from my window at work, so I reckon that's my best bet, assuming they haven't sold all on pre-order.
Had some points on Gameseek, so just ordered for £38, and I get the money back on my birthday. Not the best way to get a present I suppose, but it made it better than my daughter paying Game rob dog prices.