I have a few old TosLink cables hanging around of varying qualities and build. Let's have a peek in the closet:
This is the cheapest cable I have. I believe it was a freebie from one of my old DVD players. The only marking is along the side of the cable it says "VITOnet". Length 6' and relatively thin.
A small step up from the freebie. Branded "Thunder Cable" TosLink I got as a package with some other home theater cables I bought maybe 10 years ago from Costco locally. Again 6' and thickness of the cable about the same as the VITOnet, so it feels quite fragile in the hand.
Another step up in construction and price. A 6' Acoustic Research Pro TosLink cable. Nice gold plated connector now with good strain relief and quite a thick caliber. Maybe about $20 when I bought it. Has served me well for years between the DVD player and a Denon receiver.
Analogue Tests (RightMark, 24/96):