As long as it is a great unit and fits the bill, freight would not be a deal killer.
Why are they taking them out?
BTW, I don't know why we have come to use insert as a universal word....as builders we all know what the zero clearance units we install are, and they use a 6 or 8 inch vent. I am not looking for a real insert, like the ones built for installing in a masonry fireplace, but a unit that has a flue.