I bought some of my Bobbels at craft markets, where the winders often sell directly on site. However, I’m not a fan of color gradients because I can’t really gauge them—so mine have different but continuous colors.
I was given one with a gradient; it was from the local yarn shop and from a large manufacturer... they’re probably jumping on the bandwagon too.
By the way, the yarn isn’t really thick; the look with the different untwisted strands is just something different—though it does take some getting used to when working with it.
This here, for example, is made with 7 strands.