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It varies, but in any case, I doubt it's cheap relative to much: https://en.wikipedia.org/wiki/English_football_sponsorship

About half of those kit numbers are less per year than a single 30 second ad during the superbowl.

That's a little dishonest. The prices are in Pounds, and there a significant high outliers.

Superbowl ads currently average around $8m USD (£5.93m).

You're right, only about half of them are less than £5.93m with one of them being almost the same.