Did u check brands in wantagh?
Also theres a guy in North Bellmore somewhere who sells bikes from his house. Old bikes that he refurbishes & sells but I’m unsure if he is still there nor where he lives. I’ll try & find out. A friend told me about him years ago
Also unsure if Nemos in Oceanside sells bikes. Their website is down but u could call & ask
Update: here is the Bellmore guy. Unsure if he is still doing the whole bike thing:
http://www.kbbicycles.com/