This graphic by NASA shows the ISS compared to a football field. They’re more or less the same size, although the solar panels make the ISS a lot wider: A US football field is 109.7 x 48.8m. The space station is 108.5 x 72.8m.
Another comparison: The United States spends about $US10 billion per year in the NFL and about $US3 billion in the ISS.