Recertification depends on the age of the tank. If it is too old for recertification, you can buy a brand new one at Home Depot and get it filled, or buy a used one that is already refilled.
You can pay for recertification here or swap the tank for a new one at many big box stores who host tank exchange services. Refills here in the future are easy (and consistently less expensive) than at gas stations who may not have anyone on duty that is trained to refill tanks.
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