They have different levels depending on what kind of oil you want used. For the cheapest all possible it's around $30 all the way up to about $50 if you want the synthetic. The Walmart I do my own oil changes at also has a $10 fuel injector cleaner service that I do with every oil change.
Abigail's answer sound right, ~$40. Unless you car takes a lot of oil then more.
$44 I think
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