I figured I would try asking, as the threads I found are relatively dated. I have tried calling around including Meurice in Manhasset and Victor Talbot's in Greenvale. The others that I called [such as Stitches in Southampton] do not currently offer the service. The only one that did is Victor Talbot's, and it was $35/button hole which is more than I paid in the city at Wazin. Wazin did a great job for $20/button hole, but, if possible, I would prefer to stay on Long Island - Nassau or Suffolk. I will try asking at the big box stores such as Saks.
I really appreciate any leads or tips.
Edit: I would prefer to pay less than $20 per buttonhole, but, if they are on Long Island and come well recommended, I would choose that over going into the city.