P.S. Any competent mechanic should be able to do an oil change on the NSX. There is nothing tricky or specific to the NSX about it.
If all you need is an oil change, I suggest you find a good independent mechanic close to home, buy some oil filters from one of the usual mail order discount places (don't forget the crush washers) and bring one with you. Also if you're using synthetic 10W30, check ahead of time if the mechanic stocks it, and otherwise bring that with you, too.