The answer to 'how much does supply line cost in Chicago' is that the cost of a supply line can vary significantly depending on several factors. In general, supply lines for plumbing fixtures like sinks, toilets, and washing machines typically range from $10 to $50 for basic models, but more specialized or longer lines can cost up to $100 or more.
The exact cost will depend on the material (such as copper, PEX, or stainless steel), the length and diameter of the line, the fittings required, and the complexity of the installation. Labor costs from a professional plumber will also add to the total expense. It's best to get multiple quotes from local plumbers to get an accurate estimate for your specific project.