If the 'recent' purchase is within 30 days then the not so well-known UA rule should apply where you can get a refund of the fare difference less $50. Not heard that this was discontinued. I have even gotten a full refund before ... but YMMV. I have also been offered an ETC for the full difference. Definitely call and ask what options they can offer w/ the price drop; getting $250 back per ticket should be one of the options.