N.Y. Comp. Codes R. & Regs. tit. 9, § 225.7 – General requirements.

(a) The sale of sparkling devices by a manufacturer, distributor, wholesaler, specialty retailer, permanent retailer is limited to June 1st to July 5th and December 26th to January 2nd as restricted in General Business Law section 392-j.
(b) The sale of sparkling devices by a temporary retailer is limited to June 20th to July 5th and December 26th to January 2nd as restricted by General Business Law section 392-j and Executive Law section 156-h.
(c) Each registered specialty retailer, permanent retailer or temporary seasonal retailer shall prominently post for public view the following documents at each location where such specialty retailer, permanent retailer or temporary seasonal retailer conducts business:
1. (1) A copy of the Office of Fire Prevention and Control certificate of registration for such location.
2. (2) The list, as most recently published by the New York State Police, of counties and cities that have opted by local law to legalize the use of sparkling devices.
3. (3) A copy of a sparkling device safety pamphlet produced by the Office of Fire Prevention and Control.