Atlantic welding. There's other places as well. Do a search for welding, you'll see lots of results. Good luck. I believe they trade ur tank and don't fill on the spot.
You can take it to any place that fills co2 fire extinguishers. Just look in the yellow pages for someone who does. It shoudl be around 30 bucks for a 5lb.
there is a soda fountain wholesaler on 74th street and 16th ave, Roma syrups is the name. they do not refill your tank but they swap yours out for 5lb,10lb or 25lb. i do not recall the pricing tho
I know this is an old thread but I am setting up my calcium reactor so I dug it up. I went to liberty gas today, these guys are ass holes. All they want is your new aluminum tank. I went to airweld located in east NY at 97 Georgia Ave they were great they filled it up right away. Everry other place I called wanted to hold it for a day or even a week. If you need to fill up a co2 tank go to airweld on East NY at the other airwleld location it takes a day since they fill them at georgia ave too,