Yeah, I never would give a quote over the phone.  If the person sounded like someone I wouldn't mind working with, the standard procedure would be to tell them to come on down and let me see what you actually have and then I can give you an estimate.  I've seen way too many client labeled simple returns grow into something ugly and not so simple.  But at the same time I've had folks come in with a really basic return that a large firm charged enough to gag a maggot.  🐛