Through the years I have collected a good many sources for tools as well as supplies. One of my favorites is Banasch's. They are in Cincinnati, Ohio and carry all kind of supplies and equipment for anybody in the business of sewing. They have shears, machines, boiler irons, chairs for machine work, you name it.
Another is C. S. Osborne & Co. who are in Harrison, N. J. Their things are sold through distributors, whose names you can find on the web site.. They have tools and supplies for upholsters and awning and canvas workers.
Atlanta Thread & Supply can be reached at 1-800-847-1001. They guarantee same day shipping. They carry machines, lots of types of thread (a thread color chart is in their catalog) They have WISS shears in the 10" size that I use in the shop, and have a special pair for left handed people. They have pins, tailor's chalk and poly bags.
R. H. Rowley Co. is the favorite in North Carolina.
They have the new quick-release rings that you need if you are making Roman shades. They have Gutermann thread and polyester batting. They also offer feather and down bedding and pillow forms
Please send in your own favorite sources. In the weeks ahead I will focus on one type of tool or supplies that we all find useful.
All the best, Pat R.