in search of a good used flintlock rifle

[beowulf]

 what I`m looking for is a flintlock long rifle , in useable condition , nothing fancy , in .40 , .45 , .50 caliber ,that wont need to much work at a price between $400 and $550 dollars .$600 tops ! cva`s  and other two piece stock rifles not included ! I can get them used for as low as $60 ,in my area !  in fact a friend recently picked up a cva kentucky for $20 !

[beowulf]

 probably asking for too much