If you have some few thousand dollars to spare, maybe you will be interesting in acquiring an autograph by Charlotte Brontë herself. The Florida antiquarian Raptis Rare Books gives you the chance:
Charlotte Brontë SignatureActually, the lithograph is Elizabeth Gaskell (!).
Item Number: 32055
Extremely rare ink signature of Charlotte Brontë. Signed “yours faithfully, C.Bronte” on an off-white 3 inchess by .75 inches slip irregularly clipped and affixed to a larger scrapbook page. The page bears the signatures of several other notable British writers, including novelist and Brontë biographer Elizabeth Gaskell, Elizabeth M. Sewell, Margaret Gatty, Jean Ingelow, and Mary Martha Sherwood, as well as an address panel in the hand of Elizabeth Eastlake. Double matted and framed with a lithograph of Charlotte Brontë. The entire piece measures 18.5 inches by 21.5 inches. Exceptionally rare.