Move into the luxury sphere and the prices become stratospheric. Afternoon tea at the historic Hotel Savoy costs 45 pounds ($70), then rises to 58 pounds ($90) if you add a glass of champagne. The tip is included, but that's little consolation.
Some say these could be called the sticker-shock games.
"I just paid nearly $11 for three small tacos," said Amanda Riley, a 23-year-old student from Minneapolis who has Olympic tickets. "That would keep me in tacos for two days back home! I'm going to go broke."
Cassandra Vinograd and Gregory Katz contributed to this story from London.
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