I am on a tight budget, and want to upgrade from the stock vinyl tube that is the default Arizer whip. I intend to use silicone, and so far I haven't been able to find a physical retail source for it. Online is prohibitively expensive, as shipping triples the price of the product if you buy in consumer quantities. Any suggestions for places that would deal in this type of product? I've had no luck at my local medical supply stores, and the pet store only sells the real skinny tubing, not the 5/16 I'm looking for. Thanks in advance for any replies.