Co2
I exchange mine at Praxair in Dover, cheapest I found around and you get a certified tank, so no worries about having to pay for re-certification or your tank.
http://www.praxairwelding.com/locations/new-jersey/dover
Paintball Depot in Newton. Cheapest fill I have come across. Also the tackle shop on 31 in Washington, across from the bowling alley.
I think my husband went to that Praxair place the last time for his beer thing too. No complaints.
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