United is once again offering targeted offers for purchasing MileagePlus Miles. If you are lucky you'll get the 100% offer, we weren't as we got only 25%. At that rate we won't buy but if you get 100% then it can definitely be worthwhile to do so!
Up to 100% Bonus MileagePlus Miles when you buy miles online. Bonus varies by member. Full details. Until Dec 19, 16
Find many more MileagePlus Miles bonus offers here!