Laura and Heather will not spend days on a computer looking for a particular plant, but they will spend an hour or so.
Certainly the question of availability became highly subjective. I included many taxa that will never see a garden center but can be found with a few clicks of the mouse. Laura and Heather will not spend days on a computer looking for a particular plant, but they will spend an hour or so. The list of available natives is greatly expanded: if true gardeners want a plant badly enough, they will find it.