Got any salvage yards in your area? That's where I found mine. They do occasionally show up on craigslist, eBay and the Motorcycle Trader. Maybe an Indy shop will have a line on one. There is a thing I get in the mail everyday called the Pennysaver, it is a local advertising rag with all kinds of stuff for sale in it. Got anything like that in your area?
Right here on this forum there is a for sale section.
There is a joint called Rich's Parts\\; here's the website. Maybe he's got something you want.
Good luck.
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http://www.richsparts.com/