By Martin Lewis, June 10, 2011
A woman approached me in the street the other day and said: "I've come to London and I'm staying in a £200 a night Hilton hotel for £70".
She got this discount by turning detective on sites that offer 'secret' hotel deals.
If you're staying in a big city, these secret hotels – where you aren't told the name till you've paid – can seriously undercut usual prices.
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