No tax provided for in Code Section 48-8-82 shall be imposed upon the sale of tangible personal property which is ordered by and delivered to the purchaser at a point outside the geographical area of the special district in which the joint tax is imposed regardless of the point at which title passes, if the delivery is made by the seller's vehicle, United States mail, or common carrier or by private or contract carrier licensed by the Interstate Commerce Commission or the Georgia Public Service Commission.