How much should it cost to have on/off valves installed under sink?

I need to fix the faucet in my bathroom, but just noticed that I have no valves under the sink. I’ll have to turn off the water to the whole house in the basement in order to fix it. How inconvenient.

How much should it cost to have a plumber install those valves? I have old plumbing with solid metal tubes, no flexible line here. Thanks in advance.

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