I haven't boughtor tried one of these yet. Only heard a couple reviews from friends.
Zex 82000 Purple 10 lb Nitrous Oxide Bottle https://www.amazon.com/dp/B00068OSEU/ref=cm_sw_r_apan_glt_fabc_9CK13V66Y6T89Z279NDY
Zex 82000 Purple 10 lb Nitrous Oxide Bottle https://www.amazon.com/dp/B00068OSEU/ref=cm_sw_r_cp_api_glt_fabc_TZVB3GM77F7B8KMQV3KN
ZEX 82000 Purple 10 lb Nitrous Oxide Bottle https://www.amazon.com/dp/B00068OSEU/ref=cm_sw_r_cp_api_i_FPWNFbRPT708D
ZEX 82000 Purple 10 lb Nitrous Oxide Bottle https://www.amazon.com/dp/B00068OSEU/ref=cm_sw_r_cp_api_i_ueiIFbQP4JJK0