If they aren't willing to do that, find one that is. I could not mention many of the other fine stores that are available, since I have never dealt with them. You can find many quality stores in this magazine. I am very happy with the stores that I have mentioned. They are all different in their own way.
Some stores specialize in new guitars, others in used ones.
Some electric, some acoustic. Others work with only certain brands. It pays to go to these stores frequently to see what they have in stock. They might get in a new guitar that you didn't know about. It might even be a limited edition that you don't want to miss out on.