I've gone in with a flat before and came out with a new tube for $10-15, labor included. Most of the services they offer are very affordable.
10$ for a new tire and 10$ for the labor.
I don't know if there are different prices of tyres based on their sizes but I once changed a tube for $6 and labor was $6 as well. I also bought a tyre for $12 and paid $6 for labor also
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