I can't see one on the Apple website. I know they used to sell a Thunderbolt 2 to Gigabit Ethernet Adapter (I accidentally bought one from Amazon thinking it was Thunderbolt 3.
Does/did Apple sell one for Thunderbolt 3?
If not, it seems a little odd that Apple don't make/sell one considering it's the only way to connect a MacBook Air to a wired connection.
Does/did Apple sell one for Thunderbolt 3?
If not, it seems a little odd that Apple don't make/sell one considering it's the only way to connect a MacBook Air to a wired connection.