This feature has been requested for quite awhile by several different users.
I don’t think it’s fair to say this is on Mayumichi. Before her tool, people complained that they didn’t have a fast/convenient way to compare prices. Now they do. The lowest priced items will usually always go 1st, unless someone is loyal to a certain shop/planet/town or doesn’t want to travel far. This is just a normal supply/demand economic flow.