In fact, you can't buy tickets without being a member. The membership is 20/30. But even if you buy a member, you may not be able to apply for a ticket. So most people buy scalpers. Frying is quite expensive. I remember that Manchester United was fired to more than 200 pounds against Chelsea. The game against Manchester City was also fired 150. Even Stoke never fell100lb. Not to mention the Champions League, there is no door without 300 pounds. In fact, the maximum face value of tickets for the Premier League is about 70 pounds.
Of course, a friendly match during the summer vacation may be cheaper. If the landlord is really willing to spend money, you can go to this website: http http-www.viagogo.co is relatively reasonable and reliable.
Note that tickets are usually sold near the game, and many websites require Manchester United members.