Below are links to supplies from A Thread and Needle.
You can find supplies at other sites. I listed links to online shopping at the end of this post.
Sashiko supplies can be found on Amazon. After researching, I do not suggest purchasing kits or printed fabric from Amazon as reviews communicate poor quality. For our class, I purchased the printed fabric, thread and stencils from A Thread and Needle.
Sashiko Thimbels
This item is needed for Sashiko stitching
Sashiko Thread