There really aren't any, at least for genuine Thunderbolt 4 cables. Anker's 2.3-foot TB4 cable is $40, or about $17.40/foot, while Apple's 1-meter TB4 cable is $70, or $21.30/foot. Not a huge difference.
Apple certainly gouges people a lot of the time, but I don't think their Thunderbolt cables are an example of this; they're genuinely complicated pieces of engineering.