This is exactly what I meant by mixing it up. That clip out of the photo will make the whole process far cheaper, colored index cards, lined cards, inscribed cards or cuts and you can cut the price immensely.
Everyone and their uncle wants white unlined cards so that the entire matted piece is uniform. That pretty uniformity, sends the price into the stratosphere.
Totally get you. Nice thing about this one is it's white and grey so I will cut around it then have it mounted on a white index so it won't stand out too much against the other white cards.