ebay and wera.com have some too. Here's one in richmond
http://richmond.craigslist.org/mcy/167892837.html everyone wants an f3 for some reason so they're often hard to come by in good shape and/or you're paying a premium for them. In the used market you might have to travel a bit to get what you want.......just a warning. You'll have 10x the luck finding something in the DC area vs around here