I did a swap thru GOVRN back in 2019 and it cost me $108($85 + shipping). Not sure what they’re charging these days. I can’t remember for sure but I’m pretty sure I also had to ship the two pairs to them first.
Last time I sold on eBay I had the same problem. When they finally made it they sat at the authenticator for a couple days. My buyer messaged me asking for an update so I called eBay and voila, instantly authenticated :smh: