STT - small oxygen gas cylinder needed

I want to purchase a small (probably 20 cf) oxygen gas cylinder - not lease. Does anyone know a welding supplier in STT who sells these, or has anyone purchased one from a supplier in the states? The cylinder is sold empty so not a hazardous cargo. Caribbean Gas only rents small cylinders, and since I live on a boat and will eventually sail away with the cylinder before I use it up, I'd rather buy my own cylinder. Many thanks 🙂