Check this out. Indoor storage, 5'x8'x6' for $30 per month.
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The OP stated that the firearms were insured. If this is the case, he could store them anywhere he wishes, and in the event something were to happen to them, they would/should be covered regardless of the policies/insurance of the storage facility.I just called this place. They do NOT allow firearms to be stored on their property. I would guess this to mean that if you did it without their consent, you might subject yourself to litigation. At very least, if something happened (unit gets broken into) they will NOT compensate you for loss of unauthorized items I'm sure.
Be careful WHEREVER you store them!