You will just be fleeced by these "agents" who throw in a nights accommodation with a £40 match ticket and charge £250-£300 for the package without flights. If you know anyone in one of the supporters clubs they woul be your best bet for a ticket , obviously the games against Man C. , Liverpool , Arsenal , Chelsea are usually sold out but if you are prepared to go to see MU a mid-table team you should have no problem picking up tickets.