Good Luck, even I can't help you there. Perhaps if you defined your mom's idea of cheap....Keep in mind that European Cruises leave from 2 ports in the US unless its a re-positioning cruise, those ports are Miami and NYC. So you'd need to account for travel to and from those cities. Winter is the 3rd biggest cruising time of the year. Followed by summer first and spring break weeks second. Any time between December 15th or so and January 10th or so, is prime cruising season for winter. Most European cruises don't start for less than $1300 per person and thats an inside cabin on a smaller ship....and smaller ships in the Atlantic Ocean are NOT fun.