Hello
The place i go to and never have a problem is T.W. Whitney in Long Island City.
If you have a alluminum tank which you purchased online they also fill them or you cant rent there thats up to you.Its located 880 meeker ave.its a lil confusing heading there with the work there doing on metropolitan ave.I hope this helps
If you refilling your co2 tank i would suggest you get there at opening because they dont want to be bothered late afternoon because they get to busy it takes them 5 mins to fill