Love that Rip. Good Luck in your quest - it took me a while to get my 'extra' one. They're practically giving the 16# away on ebay. The 15# seem to go for around $75 to $100 when they show up (not too often). Since it's recently discontinued, it will probably pop up from time to time. Patience...
I wouldn't mess around trying to get a great price. If the seller puts up a 'buy it now' price that's under $100 I would jump on it if I was you.