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Valid through Oct 31.
I got the following on 2 accounts:
Buy 3,000 – 29,000 miles, get a 40% bonus
Buy 30,000 – 100,000 miles, get a 50% bonus
Works out to 1.83 cpp on 30k+
OMaaT reports that some have gotten offers as high as 60%, which would work out to 1.72 cpp.