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High Pressure Air (HPA) pumps range from $50 (eBay) Chinese handpumps to $4-5K compressors. Many members found "air freedom" with the Yong Heng or GX-CS Series compressors. The oil-less, water-less, tri-power, high speed fan cooled rectangular box compressors will work but suffer a limited lifetime and low rebuild success. Many opt for Self-Contained Breathing Apparatus (SCBA) firefighter tanks, for high pressure capacity and light weight, as compared to SCUBA tanks, filling at Paintball Shops, Dive Shops or Fire Stations. Tanks have lifetime and Pressure Test timeframes that no outside vendor will fill if expired. Expirations don't impact filling by personal compressor. The archives (upper right page corner) are full of helpful information, search using key words from this narrative, if so inclined. Best of Luck, WM