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I would recommend either Max My Points, Open Hotel Alert, or Stay With Points.
Those are the 3 I use.
openhotelalert.com
Open Hotel Alert - We alert you when sold out hotels have an open room. It's Free.
Tell us where you want to stay and when you're coming. Relax while we keep a close eye on availability (even while you sleep). When something opens up, we'll text or email you so you can book the room.