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United is offering a bonus of up to 100% miles when purchasing their miles for a limited time through December 18, 2015. This is a tiered offer and to get the full 75% bonus, you must purchase at least 30,000 miles.
This is probably one of the better (if not best) purchase United points opportunity directly through United. I personally wouldn’t purchase miles speculatively at this rate, but if you have an upcoming flight you are looking to book it is definitely worth it to see if purchasing miles is cheaper then paying the lowest available rate. Also, this could be a good way to top of the number of miles required for an award ticket. You can purchase miles here. Note: This transaction is from points.com so you will not receive bonus miles if using a credit card that gives a bonus for travel/airline purchases.