Sewingmachine.com has the best selection of supplies for monogrammers. Their selection of threads is great and they are my go to resource for my Isacord and Venus threads. I love the pre-cut tearaway and cutaway backings and they stock the sizes and weight I use. I can always count on them to have the items I need in stock and to answer and questions I might have. Again, number one source for monogrammers!