I have 11 out of Date SCBA tanks, all are filled with my 5000 psi SCUBA Compressor, we tend to use them up fairly quick when shooting the big bores, if you don't have a SCUBA compressor or a good PCP compressor rated to fill SCBA tanks, Buy one that has several years of life left and is recently Hydro tested, on the overseas Bottles, I'm not sure if Air filling Stations will fill them since they are not DOT Certified, you might get lucky and find a place to fill it, if you go that route, if I were you, I would look into a small portable PCP compressor, GX, Spirit tech, Yong Heng, and others can be purchased for under $500.00 on Fleabay, Amazoin and Wallyworld.