Thomann sell these simple K&M cable clips far cheaper than any other supplier I have found. Simply, they are essential to retain a tidy and safe environment for artists, whether on stage or in the studio. They also ensure cables look neat on camera.
Made of rugged plastic, they are virtually unbreakable. However, they can be easily lost, particularly during a de-rig at the end of the night, or if left on mic stands during the derig, or during transit. I keep a supply of these in a bum bag. One of the last things I do at the end of a rig, once all lines are checked, is to walk round the stage, securing all mic cables with two or three of these.
At the end of a gig or recording session, one of the first things I do is to similarly walk round removing them all, and replacing them into a bum bag I'm wearing, ready for the next time. By storing them in a wearable bag, rather than keeping them stored on a mic stand, you will reduce the number lost in transit.