A lot depends on what character you want it for - I got an incredible set (Bump & Grind) of bmp maps over at RDNA for several characters. Some of the Textures in the market place here come with BMP maps also. Have you tried doing a search in FreeStuff here, may be some there..... ..Just checked, using "bump" there's 138 matches - Several skin bumps in the first few pages. Cheers!