I just checked on ebay and there are several used R1 regulator. However, when I asked if there is any warranty that they work, they all replied that they are sold as is. For electronics items, I found it doesn't sound reasonable to buy something as is without even any warranty that it'll work. I guess if that's the standard practice, I can put my dead laptop ($2000 new and now dead, value at $0), dead hard drives ($250 new and now dead value at $0) on ebay and sell them for $50 as is. Geez!
-Mike-