United Airlines has been sending out emails offering MileagePlus miles at up to 45% off until December 14, 2015.
This is basically the same offer that United launched last month offering miles at up to 80% bonus (80% bonus really is 45% off).
You can access this offer on United’s website here.
The price of purchasing 138,600 (bonus included) miles at 80% bonus is 2.1 cents each.
United has had 100% bonus or 50% off (same again) buy miles sales every year. Unless you urgently need miles now, you can wait for the sales resurface again.
Here are the terms and conditions of this offer: