I remember when Cathe and Altus were a thing and she sold exercise balls, bands, medicine balls, etc. under their brand and her name. But it's been years. Not sure if Altus went out of business or they just parted ways or???
Most people seem to find fitness loops on amazon. Some brands/styles are apparently less prone to rolling than others. I tagged the bottom of this thread in case it helps you in your search.
I have a ton of different brands/styles saved in an amazon wishlist that I heard about on VF but have yet to bite the bullet since I haven't been doing loop work in a while. Plus I still have the original Altus/Cathe loops and some loops that came with workout dvds.