Hi there. Here are two places that I found in NYC for printing B&W. There are more but these are the cheapest by the hour.
ABC No Rio 212 254 3697
Opening times change so check. During the Summer it was Tues 7pm-11pm, Wed 7:30pm -11pm, Sat 3pm-7pm.
Cost $6.00 an hour
15 Rivington St NY 10002 on the 3rd floor (if there is a show or something going on the first floor just tell them you are there for the darkroom).
Brooklyn Photo 718-384-1825
Mon-Thrus 8:30am- 6:30pm, SAt-Sun 10am-6pm you must call first to book time usually in blocks of 3, 6, 9 hrs
39 Ainslie St #3 Brooklyn 11211
Hope this help. If not google search. There are more places but they charge like 20+ per hour for B&W.