I don't know if lying is such a great idea. What will you say if the machine breaks and she wants to get the receipt to exchange it? You can insist on doing it for her, I guess, but there could be an unforeseen circumstance where she ends up seeing the receipt.
Just tell her that you saw the best deal in history and you couldn't resist, because it's for her. And apologize if it makes her uncomfortable. Tell her that next year you'll find a gift just as thoughtful, for half of your budget.
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