I found an online source for cable sleeving in the US with a wide selection and great service.
I've used them for many items and they always ship fast and have an easy to navigate website.
I found their prices reasonable. For instance I looked at 9284K7 - Expandable Polyester Sleeving,
1-1/2" ID(2-1/8" expanded) available in seven colors is about $1/foot.https://www.mcmaster.com/#cable-jacketing/=15ulf8q
I have no connection with McMaster-Carr other than being a happy customer for over 10 years.
If the link does not work then just go to their site and search on "cable jacketing" , they have
many, many choices in slip-on or wrap-around styles made from various materials including