My best source
I get mine filled at a welding supply house, but it is 3 hours from here. I bought a second tank and on the 2 I can go more than one summer, and we use our stove and oven alot. I can get it at a local marina but they want seventy five bucks for an exchange, at the welding store it is fifteen dollars to fill or exchange, the marina says it it transport fees, yeah right!!
I considered converting to propane but that will be hundreds for a locker and all the pieces. Besides CNG is safer. You can ck the archives, this subject has come up before.
Dean