Hi Stretchgiraffe,
The two surgeons in the US who have most often done surgery for our Canadian members are Dr. Samji in San Jose, California & Dr. Cognetti in Philadelphia, PA. If your relative has bilateral ES, contacting Dr. Hackman in North Carolina would also be a good option as he will do bilateral surgery all at once where the other two require two surgeries - one for each side.
Getting the surgical cost from the doctors’ offices directly would give you the most current information. A ballpark figure for Dr. Samji is $11-12k per side. I’m not sure about the other two doctors though.