You would be able to get once from a surety insurance company and have them fill out Dealer Bond Under NY State Vehicle and Traffic Law Section 415 6-B and be sure the business name and mailing address match 100% with your application.
What about an official dealer sign?
You can purchase signs from all kinds of sign shops and automotive supply stores because the DMV does not provide them.
What if I am using an Assumed Name for my business?