Here is a curated list of vendors we have used in the past.
Addi Circular Knitting Machine
Herrschners, Inc. - Yarn
Hobbii - Yarn
Kamsnaps - plastic snaps & tools
Mary Maxim - Yarn
Maker's Mercantile - Addi, Yarn and More
Marshall Dry Goods - Fabric
Premier Yarns - Yarn
Sentro Circular Knitting Machine
Strapworks - webbing for handles
Wawak - Sewing Supplies
Wazoodle - specialty fabrics