United Air Lines MileagePlus Shopping Half-A-Million Mile Sweepstakes

https://www.mileageplusshopping.com/sweepstakes500.aspx
Prize: TWENTY (20) GRAND PRIZES: 25,000 United Air Lines MileagePlus® award miles will be credited to the MileagePlus® account of each winner. Winners must be MileagePlus® members at time of entry and, if not, will be required to join. All MileagePlus® terms and conditions apply with regard to usage of MileagePlus® award miles. Approximate Retail Value: $875.
 TOTAL ARV OF ALL PRIZES: $17,500.