Wiring protection materials

Grin makes a few different neoprene or spandex sleeves (with velcro) that can be used to bundle/protect wiring. I have one of these; it's the wrong shape (too long/not wide enough.) I need two or three for wiring protection on a project that's almost done.

Does anyone know of any sources for these things outside Grin? I don't think they sell them separately.

The trick is to bundle them wires in a sheath before installing the connectors. All sort of sheath available, most locally: spiral or braided, nylon, PVC, metal, PTFE... even various fireproof for appliances, aviation, marine, etc...