I don't believe any of this. Two coach loads, approximately 110 Americans just happen to be touring Manchester, not London, and want to go to both club shops and they are purchasing shirts at both?
They probably wouldn't have said "utd aka united.' Likely they would have called them "Man U or Manyoo, if you will.
If they are buying City tops they would have just bought rag shirts earlier in the day? Approximately £200, close to 250 USD, is a lot of money if you don't support either team and it is just a lark for you.
Speaking of support, if said Americans were actually there and did this, 99% chance they would absolutely not have said "I'll decide which one to support when i see who has won the most at the end of the season." "Support" is a term an English football fan would use. The typical American, who by your story appears to know nowt about football would say "be a fan of" or something similar. The rest of the sentence is a grammatical error a British English speaker would make. Americans tend to make the error of using "more" when it should be "most". In the case of your tale, they would have said it properly. Only two teams, the correct term is "more".
Why do you think they just came from the swamp? Did they bring their bags off the coach into the ub shop?
Mate, this story is bullshit from top to bottom. Even the part about you having to order their shirts online for your friends. They are from Australia, not the middle ages. They are capable of ordering the shirts themselves, you wouldn't have to do it for them.