While I agree that learning to do things yourself is valuable and will save you money, it's not for everybody. And if you ever try to run a business, you'll quickly learn that doing the tiny jobs and charging based on the actual time they take you, is simply not worth the effort. So most businesses have a minimum time charge (probably 15 minutes). $80/hour is not unreasonable to buy tools, and pay the mechanic, the cashier, the accountant, the rent, the taxes and the utilities, and turn a small profit.

If you're not interested in doing it yourself, shop around for a good flat fee tuneup. Fall isn't a particularly busy time of year in bike shop land, so you might be able to negotiate. If it's more than you want to pay, throw a number out and see what happens.