Try the manufacturer first. Part of the reason I just knocked over a bank and bought the top of the line Huskvarna Viking sewing machine was the company communicated well and indicated parts, software, and accessory support for my machine into the future instead of wanting to sell me a new machine from time to time. Also, their call center people seem knowledgable and helpful.
I now have a Husky serger as well as a sewing machine. I hope you enjoy your S217.
Pat