For YLI Size 50 (91 colors): https://www.uncommonthread.com/category-s/146.htm

Tire Brand Size 50 is also available (171 colors): http://www.superiorthreads.com/shop/...silk/products/

Kimono Size 100 (80 colors): http://www.superiorthreads.com/shop/...0yds/products/

Kinkame Size 50 (36 colors): http://www.thesewphisticatedstitcher.com/ki10sith.html

Add to those classic silk by Belding Corticelli, Rice's, and others, and you've got a bunch!