Face it, that Miata you bought cost you too much. And the upkeep on it is bleeding your bank account dry as well. When looking for lube services, like an oil change or an engine flush, the quickest and easiest option is probably to pull into a Jiffy Lube, Grease Monkey, or whatever chain lube service place is right down the street from you. But are they the best option?
Places like Jiffy Lube are notorious for performing services that are unneeded and unwarranted. They convince unknowing customers that they have an issue with their vehicle that needs to be taken care of pronto, and will do it at an extreme markup. In addition, the prices for standard oil changes are often misleading. You may see a sign that says "Oil Change $30", but when you get in and have the service done, your total may come out to double that, or more.
Having multiple friends who have worked at chain lube service places, employees are told what to upsell and what to tell customers in order to get them to spend more money. Just do a quick Google search for "oil change scam" and see what you come up with.
Your best bet? Learn to do the service yourself! You will save money, learn something new, and walk away with a sense of accomplishment. Youtube is a valuable resource!