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My bad. 2/28 - 3/2.
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Okay, $400 for those three nights at Flamingo is probably the best you are going to find (and you can always cancel it later). Just for comparison, Imperial Palace is $600 for those days.
To book it you need to book directly through
www.flamingolasvegas.com (where the listed rate is something like $730) and then claim the "Harrah's best rate guarantee." PM me and I'll walk you through how to do it.
I would hold off on the plane tickets. Sign up for ding alerts on Southwest like someone said above. Southwest isn't even accepting reservations for the dates you want yet.