The buttons are available, according to the supplies list on this item's page, from Stoney Creek. The company is on the internet. You can enter Stoney Creek cross stitch and you will find their website. They will have the buttons listed. The supplies list here has the Stoney Creek stock numbers listed. Just be sure to write those down so that you have them handy when you go to their website.

I am not an employee of ECS, but just a stitcher on this chat group. Have fun stitching!