Through tomorrow evening, 25 April, at midnight central time, United Airlines is offering a decent (though not a great) deal for the purchase of MileagePlus miles. Through this Facebook link, miles have been discounted 40% off their normal price.
Is this a good deal?
It really depends on how you will use the miles. 100,000 miles will set you back $2257.50, which includes a 7.5% excise tax. If you can find award space (and United now allows you to hold award space online or over the phone if you do not have enough miles in your account, as Continental did for years) and find that you come out cheaper than purchasing the ticket, then obviously it make sense.
But even though $2257.50 is generally a good price for a business class ticket to Europe, particularly if you work in a stopover and open jaw on the ticket (like continental Europe and Iceland or the Balkans or Georgia/Armenia), it has been fairly common the last several years to see discounted Z-fare business class tickets to Europe around that $2200 price range during the summer and holidays. Considering those fares earn quite a bit of miles, I would think twice about dropping down a lot of money just for a mielage award to Europe.
If you are short on miles or do find that a mileage redemption makes sense, remember that you only have one more day to take advantage of this offer. Don't forget that Qatar Airways award space is now on united.com, giving you further options to use your miles.