Was going to drive up to Home Depot to get another tube, but my car was blocked in by gardening stuff 
On a different tack, am seriously considering making the switch to a metal device - either the Mature Metal Jailbird or the Watchful Mistress. If I recall, it was michaelnmelissa's review/comments of the WM that piqued my interest in that device. Am considering the JB only because, with the open design, it might be just a bit easier to keep things clean.